Archive messages in Outlook for Mac - Microsoft Support
https://support.microsoft.com/en-us/office/archive-messages-in-outlook-for-mac-10a5f3f2-1c50-4477-af19-034f09289655
WEBYou can archive messages in any of the email accounts that you've connected to Outlook 2016 for Mac. These include Exchange (version 2016 and later), Microsoft 365, Outlook.com, Hotmail, iCloud, Google, and Yahoo! Choose one or more messages in your folder to archive. On the ribbon, choose Archive.
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