You can change this setting at any time.Ĭached Exchange Mode, which downloads a copy of your messages, must be turned on. Items older than 3 months reside only in your mailbox on the server. Note: If you're using Outlook 2016, you can also select an amount of time as short as 3 days.įor 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.

Under Offline Settings, move the slider to the desired amount of time, such as All, 12 months, 6 months, 3 months, or 1 month. Select an Exchange or Microsoft 365 account, and then click Change. Change how much mail to keep offlineĬlick File > Account Settings > Account Settings. Working Offline on the status bar also goes away when you’re working online. The button text doesn’t change, but it’s only highlighted when you’re working offline. When you’re ready to work online again, click Send / Receive > Work Offline. You know you’re working offline when Work Offline is highlighted on the ribbon or Working Offline appears on the status bar at the bottom of the Outlook window.

When Outlook switches between working online and offline, all email accounts are changed. Switch between working offline and working online

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