Most enterprise plans start with 100 GB of archive storage. For larger needs, auto-expanding archiving can increase this limit up to 1.5 TB . 2. Configure Retention Policies
Exchange Online Archiving service description - Microsoft Learn exchange archive solutions
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 Most enterprise plans start with 100 GB of archive storage
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 . Sign in to the Exchange Admin Center
Select the user, click the tab, and select Manage mailbox archive . Toggle Mailbox archive to On and save.
Use the command Enable-Mailbox -Identity -Archive to enable archiving for a specific user.