Outlook 365 - Work Offline

Owned by Addison Morris
Last updated: Mar 22, 2021

Offline mode allows you to view cached emails and add them to your sent que while disconnected from the network.


Cached Exchange Mode must be enabled in order to use Microsoft Outlook in Offline Mode.

Change how much mail to keep offline

  1. Click File > Account Settings > Account Settings.

    Account Settings in the Backstage view

  2. Select an Exchange or Microsoft 365 account, and then click Change.

    Change command in the Account Settings dialog box

  3. Under Offline Settings, move the slider to the desired amount of time, such as All, 12 months, 6 months, 3 months, or 1 month. Note: If you're using Outlook 2016, you can also select an amount of time as short as 3 days.

    Offline mail storage amount slider

    For example, if you move the slider to 3 months, only mail from the past three months will be synchronized to your Offline Outlook Data (.ost) file from the Exchange server. Items older than 3 months reside only in your mailbox on the server. You can change this setting at any time.


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