Microsoft 365 - How To
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      Turn on Cached Exchange Mode in Outlook

      In cached exchange mode, a copy of your mailbox is saved on your computer. This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.

      Notes: 

      • Cached Exchange Mode is the default when you add an Exchange or Office 365 account.

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

      1. Click File > Account Settings > Account Settings.

        Account Settings in the Backstage view

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

        Change command in the Account Settings dialog box

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

        Use Cached Exchange Mode check box in the Change Account dialog box

        (If you're an Office 365 subscriber with semi-annual updates, under Offline Settings, check Use Cached Exchange Mode to download email to an Outlook data file.

      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.

       

      Source: https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c#ID0EAABAAA=Newer_versions