Exchange Online Archiving service description - Microsoft Learn
The archive mailbox provides a secondary storage area that appears alongside a user’s primary folders in Outlook. Sign in to the Exchange Admin Center. Go to Recipients > Mailboxes . exchange archive solutions
Select the user, click the tab, and select Manage mailbox archive . Toggle Mailbox archive to On and save. click the tab
To set up an Exchange archive solution, you must enable the archive mailbox and configure retention policies to automate the movement of old emails. 1. Enable the Archive Mailbox exchange archive solutions