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#Outlook 2016 will not open without pst file how to
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#Outlook 2016 will not open without pst file download

ost), use the Group Policy template for Outlook (Outlk16.admx) to enable the Do not create new OST file on upgrade policy setting.įor more information about how to configure this and other settings, see Using Group Policy and the Office Customization Tool (OCT). If you must keep Outlook 2016 from creating a new compressed Outlook data file (. ost file is kept and, if it is necessary, can be opened by 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 (. When upgrading, if you do not change Cached Exchange Mode settings, the same settings are kept for Outlook 2016. Upgrading existing Cached Exchange Mode users to Outlook 2016 ost file size, see How to configure the size limit for both (.pst) and (.ost) files in Outlook.

For more information about how to configure.

ost files to a location other than the default location, see To configure a default.

For more information about how to deploy.

ost files are located in a folder that has sufficient disk space to accommodate users' mailboxes. The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format. ost files are 50 percent to 80 percent larger than the mailbox size reported in Exchange Server.

When you use Cached Exchange Mode, be aware that users' local. 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. Planning considerations for Cached Exchange Mode for Outlook 2016 At setup, the user can decide to enable Cached Exchange Mode. New Exchange accounts set up on computers running RDS use Online Mode by default. 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. Outlook 2016 supports running in Cached Exchange Mode in a Remote Desktop Services (RDS), formerly known as Terminal Services, environment that has multiple users. 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.

Retrieving rights to a rights-protected message.ĭelayed delivery options are client side in cached mode and server side in online mode.

Accessing public folders that were not made available offline.

Setting, changing, or canceling an Out of Office message.

Working with Shared Folders that were not made available offline.

These operations won't function when Outlook is not connected and can take longer to complete on high-latency connections.

Large mailboxes on computers that don't have sufficient hard disk space for a local copy of the mailbox.Įven when it is configured in Cached Exchange Mode, Outlook 2016 must contact the server directly to do certain operations.

In addition, we recommend that you consider using Encrypting File System (EFS) or BitLocker as a robust solution.

Heavily regulated compliance or secure environments where it is a risk to store data locally.

#Outlook 2016 will not open without pst file download

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.

Online mode is useful in the following situations:

Users who have high-latency connections (greater than 500 ms) to Exchange Server.

#Outlook 2016 will not open without pst file Offline

Users who frequently work offline or without connectivity.

Users who frequently move in and out of connectivity.

Mailbox data is only cached in memory and never written to disk.Ĭached Exchange Mode is the preferred configuration in Outlook 2016 and is useful in the following situations: Online Mode works by using information directly from the server, and, as the name implies, it requires a connection.

We recommend always using Cached Exchange Mode with an Office 365 account.