You can archive messages in any of the email accounts that you've connected to Outlook 2016 for Mac.
An archived item (or items) remains accessible, but doesn't clutter your Inbox. This feature allows you to quickly move an item from your Inbox or another folder to an archive folder. Outlook 2016 for Mac includes a new feature called one-click archiving. Outlook for Microsoft 365 for Mac Outlook 2021 for Mac Outlook 2019 for Mac Outlook 2016 for Mac More.