Turn Cached Exchange Mode on or off

  1. Click File > Account Settings > Account Settings.

    Account Settings in the Backstage view

  2. Click the Exchange or Microsoft 365, and then click Change.

    Change command in the Account Settings dialog box

  3. Under Offline Settings, check Use Cached Exchange Mode.


    Account setup dialog, Exchange Account Settings page.

4. Exit, and then restart Outlook.

If you want to turn off Cached Exchange Mode, repeat the steps, but clear Use Cached Exchange Mode.