ost file is restricted by policies, caching shared folders may result in the. ost file as well.įor more information about large Outlook data files and performance, see You may experience application pauses if you have a large Outlook data file. This can result in an increase in size for the. ost file size might grow significantly.Īlso, if you have permissions to a site mailbox, and the Download Shared Folders option is enabled in Outlook, the contents of the site mailbox are synchronized to your local. If the shared folders contain many items or large attachments, the size of your. If Outlook is configured to download shared folders, the contents of the shared folders are stored in your local Offline Outlook Data (.ost) file. Effect of cached shared folders on the size of the Offline Outlook Data (.ost) file The performance gained by using locally cached folders is even more noticeable if the shared folders are located on an Exchange Online mailbox in Microsoft 365. This is because Outlook reads the folder data from the local hard disk instead of connecting to the Microsoft Exchange Server to retrieve the shared folders. Working with shared folders that are downloaded locally provides better performance. Therefore later versions of Outlook were changed to also cache mail folders by default. With hardware advancements, increased disk sizes and speeds, the impact of caching more data locally was reduced. In the versions of Outlook earlier than Outlook 2010 when hard disk space was at a premium, only non-mail folders were cached by default. Mail folders typically contain more items that non-mail folders. You can identify that this folder is being cached in Outlook because the status bar displays Connected when this folder is selected in the navigation pane. The following screenshot displays the shared Inbox folder of a user. This is a change from Microsoft Office Outlook 2007 in which only non-mail folders from shared mailboxes are cached by default. If you add another user's shared mailbox or shared folder to your profile, then all the folders in the shared mailbox to which you have access are downloaded to your local cache by default. Consider that you have a profile which is configured in Cached Exchange mode in Microsoft Outlook 2010 or a later version.
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