

If you want to turn off Cached Exchange Mode, repeat the steps, but clear Use Cached Exchange Mode.īy default, 12 months of your email is available offline, but you can control how much mail is kept offline. (If you're a Microsoft 365 subscriber with semi-annual updates, under Offline Settings, check Use Cached Exchange Mode to download email to an Outlook data file. Under Offline Settings, check Use Cached Exchange Mode. accounts default to Cached Exchange Mode and cannot be changed.Ĭlick File > Account Settings > Account Settings.Ĭlick the Exchange or Microsoft 365, and then click Change.

We recommend always using Cached Exchange Mode with an Exchange or Microsoft 365 account. It does not apply the sync settings to the new Groups feature as Groups are cached in in a separate data file (account-name.nst).Cached Exchange Mode is the default when you add an Exchange or Microsoft 365 account. Outlook 2016 applies the sync setting to shared or delegate folders and mailboxes, and public folders that are cached. When Exchange server users have shared or delegate folders, shared mailboxes, and public folders in a profile, Outlook 2013 caches the contents of these folders in the *.ost file, however, the sync setting does not apply to these folders, and all contents of these folders are stored in the local cache file. Shared or delegated (Outlook 2013 only).The sync settings do not apply to the following Outlook items.

Users will need to use Instant Search or OWA to view older messages.

In Outlook 2016, shared mailboxes do not (currently) have the link (or active View on Server button) to view more messages on the server. You can also click the View on Server button on the Folder tab to view messages not synced locally. To view mail that is not synced down, click on " Click here to view more on Microsoft Exchange" at the bottom of the message list. IMAP accounts can synchronize as little as 1 month. In Outlook 2013 or if you open the profile using the Mail Setup dialog (Control Panel > Mail), the dialog will look similar to this:įor Outlook 2013, Exchange accounts can synchronize as little as 1 month, while Exchange accounts (including ) in Outlook 2016 and up can synchronize as little as 3 days of messages. In new versions of Outlook, the dialog looks like this: The default setting is based on the free space available on your hard drive. Slide the control to determine how much older email is stored offline. To check the sync settings, open File, Account Settings dialog and double click on the email account.
