Office 365, Email, Exchange, Change how much mail to keep offline

This page describes how to change the amount of mail Outlook keeps stored offline.

This page describes how to change the amount of mail Outlook keeps stored offline.

With a Microsoft Exchange Server account, you decide how much mail is available when working offline with a slow or no network connection.

1. Click File > Account Settings > Account Settings.

Settings

2. Select an Exchange account, and then click Change.

Change

3. Under Offline Settings, set the slider to your desired time frame which ranges from 3 days to All Email. Cached Exchange Mode, which downloads a copy of your messages, must be turned on.

Mail to keep offline

Note: This should be change to "All" before archiving or exporting mail in order to ensure all mail is included in the archive file.