When you have Cached Exchange Mode enabled, Outlook by will by default cache the main Global Address List as well. This is called the Offline Address Book and is being generated on the Exchange server.
In the navigation pane, Ctrl+click or right-click the Exchange folder for which you want to empty the cache, and then click Properties. On the General tab, click Empty Cache. After the folder is empty, Outlook automatically downloads the items from the Exchange server.
Due to various synching schedules, it can take up to 48 hours before you could actually see a change in Outlook after a modification has been made on the Exchange server or in Active Directory.
In this guide, the relevant timings are explained and instructions are given in how you can directly force an update and resync, which can be very handy when troubleshooting or when you work in an Exchange environment which sees a lot of user mailbox mutations.
The automatic sync and update schedules
After a change had been made to any of the Address Book attributes which is also included in the Offline Address Book (OAB), the following occurs:
- Exchange regenerates the OAB
Default generation schedule: 24 hours - Exchange distributes the OAB
Default distribution schedule: 480 minutes - Outlook downloads the OAB
Default update schedule: 24 hours
This means that in the worst possible scenario, an update to the Address Book won’t become available to the user until 48 hours after the change.
This situation however is extremely rare since the default maintenance time on Exchange is at 5:00 AM and updates and downloads are usually performed during working hours.
- In the navigation pane, Ctrl+click or right-click the Exchange folder for which you want to empty the cache, and then click Properties. On the General tab, click Empty Cache. After the folder is empty, Outlook automatically downloads the items from the Exchange server.
- How to Disable Cached Mode in Outlook. Exchange mail accounts by default use cached exchange mode, which makes Outlook store your recent messages and contacts on your computer for easier access.
Updating Outlook manually
Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from. And since this website’s main focus is on Outlook, it makes sense to start with Outlook as well ;-).
The command for the manual update procedure can be found here:
- Outlook 2010 and Outlook 2013
tab Send/Receive-> Send/Receive Groups-> Download Address Book… - Outlook 2007 and previous
Tools-> Send/Receive-> Download Address Book…
Outlook will automatically download updates only unless the size of the changes is larger than 12.5% (one-eighth) of the total OAB size. In that case the whole OAB is being downloaded again. In a later section, it is explained how to modify this.
You can manually update your OAB rather than to wait 24 hours.
Modify the OAB update frequency in Outlook
To alter the default OAB update interval of 24 hours to a higher frequency, you’ll need to define a new Send/Receive group.
- Open the Send/Receive Groups dialog
- Keyboard shortcut: CTRL+ALT+S
- Outlook 2010 and Outlook 2013
tab Send/Receive-> Send/Receive Groups-> Define Send/Receive Groups - Outlook 2007 and previous
Tools-> Send/Receive-> Send/Receive Settings-> Define Send/Receive Groups
- Click New.
- Provide a name for the group. For instance: Download OAB
- Select your Exchange account and enable the option: Include the selected account in this group
- Disable all the options in the “Account Options” section except for: Download offline address book
- Verify that the option “Include the selected account in this group” for all the other accounts you might have are not selected.
- Click OK to return to the Send/Receive Groups dialog.
- Select your newly created Send/Receive group.
- Disable all the options except for the first reference to: Schedule an automatic send/receive every x minutes.
- Set your preferred interval but don’t set it too low. If the update frequency of the OAB files on the Exchange server hasn’t been increased, you’ll only end up slowing down your Outlook Send/Receive performance.
By creating an additional Send/Receive Group, you can control how often Outlook will check for OAB updates (click on an image to enlarge it).
Modify the OAB download behavior in Outlook
There are various Registry settings available to control or modify the update and download behavior of the Offline Address Book in Outlook.
Use Cached Exchange Mode but without OAB
To always work with the Online Address Book, even when you have Cached Exchange Mode enabled, you can set the following Registry key and value.
To always work with the Online Address Book, even when you have Cached Exchange Mode enabled, you can set the following Registry key and value.
Key:
Value name:
Value type:
Value:
HKEY_CURRENT_USERSoftwareMicrosoftOffice<version>OutlookCached Mode
Value name:
DownloadOAB
Value type:
REG_DWORD
Value:
0
Tip!
Another way to look at the on-line Address Book without disabling the OAB is by opening the Address Book (CTRL+SHIFT+B) and use the Address Book dropdown list to set it to All Address Lists-> All Users or any other object type such as All Contacts, All Groups or All Rooms.
Another way to look at the on-line Address Book without disabling the OAB is by opening the Address Book (CTRL+SHIFT+B) and use the Address Book dropdown list to set it to All Address Lists-> All Users or any other object type such as All Contacts, All Groups or All Rooms.
Full OAB download threshold
To modify the threshold at which Outlook will download the full OAB rather than the incremental update, you can set the following Registry value
To modify the threshold at which Outlook will download the full OAB rather than the incremental update, you can set the following Registry value
Key:
Value name:
Value type:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangeExchange Provider
Value name:
OAB Dif Divisor
Value type:
REG_DWORD
As the value, set at which relative size a full OAB download should take place rather than an incremental update. For instance, setting the value to 4 will trigger a full download when the incremental update is larger than one-fourth the size of the full OAB. When the value is set to 0, Outlook will use 16 to prevent a “divide by 0” error. If the key name doesn’t exist, Outlook uses a value of 8.
Prompt before for full download
As the OAB can be quite large in some environments, it could be wise to be prompted when Outlook wants to download the full OAB. This allows you to abort the update process when you are for instance on a slow or expensive connection.
As the OAB can be quite large in some environments, it could be wise to be prompted when Outlook wants to download the full OAB. This allows you to abort the update process when you are for instance on a slow or expensive connection.
Key:
Value name:
Value type:
Value:
HKEY_CURRENT_USERSoftwareMicrosoftExchangeExchange Provider
Value name:
Allow Full OAB Prompt
Value type:
REG_DWORD
Value:
1
You can get prompted if you sometimes want to prevent a full OAB download.
Location of the cached oab-files
Rather than forcing an OAB update via the Outlook interface, you can also manually delete them when Outlook is closed.
- Windows Vista, Windows 7 and Windows 8
C:Users%username%AppDataLocalMicrosoftOutlook
- Windows XP
C:Documents and Settings%username%Local Application DataMicrosoftOutlook
You can paste the path mentioned above in the Address Bar of Explorer to quickly open the location.
Note:
As Outlook 2010 an Outlook 2013 can connect to multiple Exchange servers in a single mail profile, there is an additional “Offline Address Books” subdirectory which contains folders with GUID references which contain the actual oab-files. Finding out which GUID represents which mail account isn’t very straightforward but looking at the “Date modified” value of the folder should give you a good indication if you don’t want to simply delete all folders or rename them to .old.
As Outlook 2010 an Outlook 2013 can connect to multiple Exchange servers in a single mail profile, there is an additional “Offline Address Books” subdirectory which contains folders with GUID references which contain the actual oab-files. Finding out which GUID represents which mail account isn’t very straightforward but looking at the “Date modified” value of the folder should give you a good indication if you don’t want to simply delete all folders or rename them to .old.
You’ll find the following 6 oab-files in this location which make up the full Offline Address Book:
uanrdex.oab | Ambiguous names index |
ubrowse.oab | Main index |
udetails.oab | Contains all the published details |
updndex.oab | Index with changes to domain names and its lists |
urdndex.oab | Relative distinguished names index |
utmplsts.oab | Template strings for OAB dialog boxes |
If you are still using Outlook 2002/XP or previous, the file names won’t have a “u” in front of their name.
You’ll have to rename them all to .old or, in the case of Outlook 2010 or Outlook 2013, rename the folder containing the oab-files to .old to reset the local Offline Address Book. Renaming just a single or some of the files will result in an OAB corruption.
Tip!
A benefit of manually deleting the oab-file is that before they are being re-downloaded, you are working with the Online Address Book. When you find things working correctly for you now but not anymore after the oab-file were redownloaded, you know that the issue is with the oab-files on the server and not on the client or the Address Book configuration in general.
A benefit of manually deleting the oab-file is that before they are being re-downloaded, you are working with the Online Address Book. When you find things working correctly for you now but not anymore after the oab-file were redownloaded, you know that the issue is with the oab-files on the server and not on the client or the Address Book configuration in general.
Modify default maintenance schedule in Exchange
When you update an Offline Address Book on the Exchange server via the Exchange Management Console or the Exchange Management Shell, one would suspect that updating the Outlook client after that would directly get you this fully up-to-date copy. Wrong!
After the OAB gets updated on Exchange, it still needs to distributed to the web services first, even in a single server environment. The process of updating and distributing the OAB is achieved by the following two schedules.
OAB Update schedule
To change the OAB Update Schedule via the Exchange Management Console:
Organization Configuration-> Mailbox-> tab Offline Address Book-> double click on the Offline Address Book for which you want to change the schedule-> tab General
To change the OAB Update Schedule via the Exchange Management Console:
Organization Configuration-> Mailbox-> tab Offline Address Book-> double click on the Offline Address Book for which you want to change the schedule-> tab General
Via the Exchange Management Shell, you can use the Set-OfflineAddressBook PowerShell command to change the schedule:
Set-OfflineAddressBook '<name of OAB>' -schedule <schedule format>
Example:
Set-OfflineAddressBook 'Default Offline Address Book' –schedule 'So.05:00-So.05:15, Mo.05:00-Mo.05:15, Di.05:00-Di.05:15, Mi.05:00-Mi.05:15, Do.05:00-Do.05:15, Fr.05:00-Fr.05:15, Sa.05:00-Sa.05:15'
OAB Distribution schedule
To set the OAB distribution polling schedule via the Exchange Management Console:
Server Organization-> Client Access-> select the server for which you want to change the schedule-> bottom section: tab Offline Address Book Distribution-> double click on the name of the OAB-> tab General
To set the OAB distribution polling schedule via the Exchange Management Console:
Server Organization-> Client Access-> select the server for which you want to change the schedule-> bottom section: tab Offline Address Book Distribution-> double click on the name of the OAB-> tab General
Via the Exchange Management Shell, you can use the Set-OABVirtualDirectory PowerShell command to change the polling schedule:
Set-OABVirtualDirectory -Identity '<ServerOfflineAddressBookVirtualDirectoryName>' -PollInterval <value in minutes>
Example:
Set-OABVirtualDirectory -Identity 'Exchange01OAB (Default Web Site)' -PollInterval 480
Force OAB update and redistribution on Exchange
Rather than changing the default schedule, you can also force an update and redistribution of the Offline Address Book. This is great for testing or when it is important that changes are published immediately (note that users must still update the OAB manually or wait a OAB sync interval to see the changes).
Update the Offline Address Book
To update the Offline Address via the Exchange Management Console:
Organization Configuration-> Mailbox-> tab Offline Address Book-> right click on the Offline Address Book for which you want to update-> Update
To update the Offline Address via the Exchange Management Console:
Organization Configuration-> Mailbox-> tab Offline Address Book-> right click on the Offline Address Book for which you want to update-> Update
Via the Exchange Management Shell, you can use the Update-OfflineAddressBook PowerShell command to update an OAB:
Update-OfflineAddressBook -Identity '<name of the OAB>'
Example:
Update-OfflineAddressBook -Identity 'Default Offline Address Book'
Distribute the OAB files
To force the distribution of the OAB files, you can’t use the Exchange Management Console but can only use the Update-FileDistributionService PowerShell command for the Exchange Management Shell:
To force the distribution of the OAB files, you can’t use the Exchange Management Console but can only use the Update-FileDistributionService PowerShell command for the Exchange Management Shell:
Update-FileDistributionService '<CAS Server Name to update>' -Type 'OAB'
Example:
Update-FileDistributionService 'Exchange01' -Type 'OAB'
Distribute the OAB files to all the servers at once
Rather than to distribute the OAB files per server, you can also update it to all CAS servers at once by pipelining it with the Get-ClientAccessServer cmdlet via the following one-liner:
Rather than to distribute the OAB files per server, you can also update it to all CAS servers at once by pipelining it with the Get-ClientAccessServer cmdlet via the following one-liner:
Get-ClientAccessServer | Update-FileDistributionService -Type 'OAB'
Outlook 2016 provides two basic connectivity modes when you are connected to Exchange Server: Cached Exchange Mode and Online Mode.
Note
This article is for IT Pros and admins that are deploying and configuring Outlook 2016 for Windows for users in their enterprises. If you're a user trying to configure your Outlook settings, see Turn on Cached Exchange Mode.
Comparison of Cached Exchange Mode and Online Mode
Cached Exchange Mode gives users a seamless online and offline Outlook experience by caching the user's mailbox and the Offline Address Book (OAB) locally. With Cached Exchange Mode, which is the default setting for users, Outlook no longer depends on continuous network connectivity for access to user information. When a user is connected, Outlook continuously updates users' mailboxes so that the mailboxes are kept up to date. If a user disconnects from the network, for example, by moving to an area without Wi-Fi access, the user can continue to access the last available email data.
Important
We recommend always using Cached Exchange Mode with an Office 365 account.
Online Mode works by using information directly from the server, and, as the name implies, it requires a connection. Mailbox data is only cached in memory and never written to disk.
Cached Exchange Mode is the preferred configuration in Outlook 2016 and is useful in the following situations:
- Users who frequently move in and out of connectivity.
- Users who frequently work offline or without connectivity.
- Users who have high-latency connections (greater than 500 ms) to Exchange Server.
Online mode is useful in the following situations:
- Kiosk scenarios, where a particular computer has many users who access different Outlook accounts—and the delay to download email messages to a local cache is unacceptable.
- Heavily regulated compliance or secure environments where it is a risk to store data locally. In addition, we recommend that you consider using Encrypting File System (EFS) or BitLocker as a robust solution.
- Large mailboxes on computers that don't have sufficient hard disk space for a local copy of the mailbox.
Even when it is configured in Cached Exchange Mode, Outlook 2016 must contact the server directly to do certain operations. These operations won't function when Outlook is not connected and can take longer to complete on high-latency connections. These operations include the following:
- Working with Shared Folders that were not made available offline.
- Retrieving Free/Busy information.
- Setting, changing, or canceling an Out of Office message.
- Accessing public folders that were not made available offline.
- Retrieving rights to a rights-protected message.
- Editing rules.
- Retrieving MailTips.
- Retrieving Policy Tips.
Delayed delivery options are client side in cached mode and server side in online mode. So, when you use Cached Exchange Mode, Outlook must be connected and open at the assigned delivery time for the delayed delivery message to be sent.
Outlook 2016 supports running in Cached Exchange Mode in a Remote Desktop Services (RDS), formerly known as Terminal Services, environment that has multiple users. When you configure a computer running RDS to use Cached Exchange Mode, be sure to consider the additional storage space and disk I/O that are required for multiple client accesses. New Exchange accounts set up on computers running RDS use Online Mode by default. At setup, the user can decide to enable Cached Exchange Mode.
Planning considerations for Cached Exchange Mode for Outlook 2016
In some cases, you can improve the performance of Cached Exchange Mode for your whole organization or for a group of users—for example, users who work remotely.
Outlook data file (.ost) recommendations
When you use Cached Exchange Mode, be aware that users' local '.ost' files are 50 percent to 80 percent larger than the mailbox size reported in Exchange Server. The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format.
The maximum size for '.ost' files are configurable. The default is 50 GB of data storage. Make sure that users' '.ost' files are located in a folder that has sufficient disk space to accommodate users' mailboxes.
- For more information about how to deploy '.ost' files to a location other than the default location, see To configure a default .ost location by using Group Policy
- For more information about how to configure '.ost' file size, see How to configure the size limit for both (.pst) and (.ost) files in Outlook.
Upgrading existing Cached Exchange Mode users to Outlook 2016
When upgrading, if you do not change Cached Exchange Mode settings, the same settings are kept for Outlook 2016.
However, by default, when Outlook 2016 is installed and Cached Exchange Mode is enabled, a new compressed version of the Outlook data file (.ost) is created. The earlier version of the '.ost' file is kept and, if it is necessary, can be opened by Outlook 2016. If you must keep Outlook 2016 from creating a new compressed Outlook data file (.ost), use the Group Policy template for Outlook (Outlk16.admx) to enable the Do not create new OST file on upgrade policy setting.
For more information about how to configure this and other settings, see Using Group Policy and the Office Customization Tool (OCT).
Note
The Exchange Fast Access feature that was added to Outlook 2013 Exchange Cached Mode has been deprecated in Outlook 2016.
Managing performance issues in Outlook
Most users find that Cached Exchange Mode performs faster than online mode. However, several factors can influence a user's perception of Cached Exchange Mode performance, like hard disk size and speed, CPU speed, '.ost' file size, and the expected level of performance.
For troubleshooting tips about diagnosing and addressing performance issues in Outlook, see How to troubleshoot performance issues in Outlook.
Managing Outlook folder sharing
By default, when Cached Exchange Mode is enabled, shared mail and nonmail folders that users access in other mailboxes are downloaded and cached in the user's local .ost file. Similarly, if a manager delegates access to his or her Inbox to a team member, when the team member accesses the folder, Outlook 2016 also starts caching the Inbox folder locally.
You can disable caching of all shared folders for profiles that have Cached Exchange Mode enabled. To do this, configure the Download shared non-mail folders option in the Office Customization Tool (OCT) when you customize your Cached Exchange Mode deployment. This setting applies to both mail and nonmail folders in Outlook 2016.
If you want to disable caching of shared mail folders (like a delegated Inbox) but not shared nonmail folders (like Calendar), see By default, shared mail folders are downloaded in Cached mode in Outlook 2010 and later versions.
For more information about how to configure these settings, see Using Group Policy and the Office Customization Tool (OCT).
Site mailboxes
As an alternative to Public Folders, consider Site Mailboxes. Site mailboxes improve collaboration and user productivity by allowing access to both SharePoint Server documents and Exchange email that is in the same client interface. A site mailbox consists of SharePoint Server site membership (owners and members), shared storage through an Exchange Server mailbox for email messages and a SharePoint Server site for documents, and a management interface that addresses provisioning and life-cycle needs. SharePoint Server documents that are viewed in the site mailbox are stored only on SharePoint Server. For more information, see Configure site mailboxes in SharePoint Server.
Managing Outlook behavior for slow connections
Outlook is configured to determine a user's connection speed by checking the network adapter speed on the user's computer (supplied by the operating system). If the reported network adapter speed is 128 KB or lower, the connection is defined as a slow connection.
When a slow connection to an Exchange Server computer is detected, Outlook helps users have a better experience if they reduce the less important information that is synchronized with the Exchange Server computer. Outlook makes the following changes to synchronization behavior for slow connections:
- Switches to downloading only headers.
- Does not download the Offline Address Book or OAB updates.
- Downloads the body of an item and associated attachments only when it is requested by the user.
Outlook continues to synchronize the Outlook data with mobile devices, and some client-side rules might run.
Note
We recommend that you do not synchronize mobile devices when the Cached Exchange Download only headers setting is enabled. When you synchronize a mobile device by using ActiveSync, for example, full items are downloaded in Outlook, and the synchronization process is less efficient than it is during regular Outlook synchronization to users' computers.
The Download only headers setting for synchronization is designed for Outlook users who have dial-up connections or cellular wireless connections, to minimize network traffic when there is a slow or expensive connection.
For a scenario where users' actual data throughput is slow, even though their network adapters report a fast connection, you can disable automatic switching to downloading only headers by using the Group Policy option, Disallow On Slow Connections Only Download Headers. Similarly, there might be connections that Outlook has determined are slow but which provide high data throughput to users. In this case, you can also disable automatic switching to downloading only headers.
You can configure the On slow connections, download only headers option in the Office Customization Tool (OCT), or configure the option by using Group Policy to set Disallow On Slow Connections Only Download Headers.
For more information about how to configure these settings, see Using Group Policy and the Office Customization Tool (OCT).
Configure Cached Exchange Mode for Outlook 2016
Offline data file (.ost file) and Offline Address Book (OAB)
When an Outlook 2016 account is configured to use Cached Exchange Mode, there's always a local copy of a user's Exchange mailbox ready in an offline data file (.ost file) on the user's computer. By default, the '.ost' file is in the C:Users<username>AppDataLocalMicrosoftOutlook folder.)
Whenever the user is offline and using Outlook 2016, the program works from this local copy and with the Offline Address Book (OAB). When the user is online, the cached mailbox and OAB are periodically updated from Exchange Server in the background. Any email messages the user drafted while offline are automatically sent when that user is back online.
If a user upgrades from an earlier version of Outlook to Outlook 2016 and you previously configured Outlook for Cached Exchange Mode, those old Cached Exchange Mode settings are automatically applied, including a new synchronization control for shared mailboxes. The default location for new '.ost' or OAB files is: %userprofile%AppDataLocalMicrosoftOutlookOffline Address Books. As an administrator, you can configure a different '.ost' file location for users in your organization who do not already have '.ost' files. If you do not specify a different '.ost' file location, Outlook creates an '.ost' file in the default location when users start Outlook in Cached Exchange Mode.
'Mail to keep offline' setting
The Mail to keep offline slider in the Server Settings dialog box in Outlook 2016 has been updated to apply to shared folders and lets you set a smaller synchronization window, available by default with Cached Exchange Mode in Outlook 2016.
The slider allows an Outlook 2016 user to limit the email messages that are locally synchronized in a Microsoft Outlook data file (.ost). By default, if Cached Exchange Mode is enabled, Outlook 2016 caches email messages only from the last 12 months and removes anything older from the local cache for the PC. These default settings depend on the device, with mobile devices having smaller default settings. The email messages that are removed from the local cache are still available for users to view, but they'll need to be connected to Exchange Server to view them. Users can view messages that were removed from the local cache by scrolling to the end of a message list in a folder and clicking the message Click here to view more on Microsoft Exchange. Users can also change how much email to keep offline. You, the administrator, can change the default age or enforce the age of email messages that are removed from the local cache.
Using Group Policy and the Office Customization Tool (OCT)
Use the following procedures to configure Cached Exchange Mode settings by using the OCT or Group Policy. Remember that customizing Cached Exchange Mode settings is optional.
Note
- To get the Group Policy and Office Customization Tool (OCT) files, download the Office 2016 Administrative Template files (ADMX/ADML) and Office Customization Tool from the Microsoft Download Center.
- The Office Customization Tool can only be used to configure volume licensed versions of Outlook, such as the version of Outlook that comes with Office Standard 2016.
To configure Cached Exchange Mode settings by using the OCT
- In the OCT tree view, find Outlook, and click Add Accounts. In the Account Name column, click the account you want to configure, and click Modify to display the Exchange Settings dialog box.
- Click More settings.
- Click the Cached Mode tab.
- Click Configure Cached Exchange Mode, and select the Use Cached Exchange Mode check box to enable Cached Exchange Mode for users. (By default, Cached Exchange Mode is disabled.)
- Choose a default download option on the Cached Mode tab:
- Download only headers: Users see header information and the beginning of the message. They can download the full message in several ways—for example, by double-clicking to open the message or by clicking Download the rest of this message now in the reading pane.
- Download headers followed by the full item: All headers are downloaded first, and then full items are downloaded. The download order might not be chronological, but that shouldn't be noticeable to the user. Microsoft Outlook downloads headers followed by full items in the folder that the user is currently accessing, and then it downloads headers followed by full items in folders that the user has recently viewed.
- Download full items: Full items are downloaded. We recommend this option unless you have a slow network connection. The download order might not be chronological, but that shouldn't be noticeable to the user. Microsoft Outlook downloads full items in the folder that the user is currently accessing, and then it downloads full items in folders that the user has recently viewed. You might want to pair this with the On slow connections, download only headers option.
To configure Cached Exchange Mode settings using Group Policy
- In Group Policy, load the Outlook 2016 template.
- Open the Group Policy Management Console (GPMC), and in the tree view, expand Domains, and expand Group Policy Objects.
- Right-click the policy object that you want, and click Edit. The Group Policy Management Editor window opens.
- In the tree view, go to User Configuration > Policies > Administrative Templates > Microsoft Outlook 2016 > Account Settings > Exchange > Cached Exchange Mode.
- In the reading pane, in the Setting column, open the policy that you want to set by double-clicking it. For example, in the Exchange reading pane, open Use Cached Exchange Mode for new and existing Outlook profiles.
- Select Enabled, and select an option (if appropriate).
- Click OK.
To configure a default .ost location by using Group Policy
- In Group Policy, load the Outlook 2016 template.
- Open the Group Policy Management Console (GPMC), and in the tree view, expand Domains, and then expand Group Policy Objects.
- Right-click the policy object that you want, and click Edit. The Group Policy Management Editor window opens.
- In the tree view, go to User Configuration > Policies > Administrative Templates > Microsoft Outlook 2016 > Miscellaneous > PST Settings.
- Double-click Default location for OST files to open it.
- Click Enabled to enable the policy setting.
- In the Default location for OST files text box, enter the default location for '.ost' files. For example:%userprofile%Local SettingsApplication DataMicrosoft newfolder.
- Click OK.You can define a new default location for both Personal Microsoft Outlook data files (.pst) and '.ost' files. After you click PST Settings in the tree view, double-click to open the Default location for PST files setting in the reading pane.
To prevent a new .ost file from being created
- In Group Policy, load the Outlook 2016 template.
- Open the Group Policy Management Console (GPMC), and in the tree view, expand Domains, and expand Group Policy Objects.
- Right-click the policy object that you want, and click Edit. The Group Policy Management Editor window opens.
- In the tree view, go to User Configuration > Policies > Administrative Templates > Microsoft Outlook 2016 > Account Settings > Exchange.
- Double-click Do not create new OST file on upgrade to open it.
- Click Enabled to enable the policy setting, and then click OK.
Additional Group Policy and OCT settings
The following table shows some settings that you can configure for Cached Exchange Mode. In Group Policy, you can find the settings under User ConfigurationPoliciesAdministrative TemplatesMicrosoft Outlook 2016Account SettingsExchangeCached Exchange Mode. The OCT settings are in corresponding locations on the Modify user settings page of the OCT.
Outlook 2016 Disable Cache Mode
Cached Exchange Mode settings
Setting name | Description |
---|---|
Cached Exchange Mode Sync Settings | Enable to configure how much user email that Outlook synchronizes locally by date of message. To allow all email messages regardless of date to synchronize to users' local mailbox cache, enable and select All from the list. By default, if you do not configure this setting, Outlook synchronizes email messages sent or received in the last 12 months to users' local mailbox cache (.ost). |
Disallow Download Full Items | Enable to turn off the Download Full Items option in Outlook. To find this option, choose the Send/Receive tab, and then choose Download Preferences. |
Disallow Download Headers | Enable to turn off the Download Headers option in Outlook. To find this option, choose the Send/Receive tab. |
Disallow Download Headers then Full Items | Enable to turn off the Download Headers then Full Items option in Outlook. To find this option, choose the Send/Receive tab, and then choose Download Preferences. |
Disallow On Slow Connections Only Download Headers | Enable to turn off the On Slow Connections Download Only Headers option in Outlook. To find this option, choose the Send/Receive tab, and then choose Download Preferences. |
Download Public Folder Favorites | Enable to synchronize Public Folder Favorites in Cached Exchange Mode. |
Download shared non-mail folders | Enable to synchronize shared nonmail folders in Cached Exchange Mode. |
Use Cached Exchange Mode for new and existing Outlook profile | Enable to configure new and existing Outlook profiles to use Cached Exchange Mode. Disable to configure new and existing Outlook profiles to use Online Mode. |
The following table shows some additional settings that you can configure for Exchange connectivity. In Group Policy, you can find the settings under User ConfigurationPoliciesAdministrative TemplatesMicrosoft Outlook 2016Account SettingsExchange. The OCT settings are in corresponding locations on the Modify user settings page of the OCT.
Exchange connectivity settings
Setting name | Description |
---|---|
Configure Outlook Anywhere (RPC over HTTP) user interface options | Enable to let users view and change user interface (UI) options for Outlook Anywhere (RPC over HTTP). |
Do not allow an OST file to be created | Enable to prevent offline folder use. |
Do not create new OST file on upgrade | Enable to force Outlook 2016 to use the existing '.ost' file that was created by an earlier version of Outlook. If you disable or do not configure this setting (recommended), a new '.ost' file is created when you upgrade to Outlook 2016. |
Synchronizing data in shared folders | Enable to control the number of days that elapses without a user accessing an Outlook folder before Outlook stops synchronizing the folder with Exchange. |