If you have recently migrated to Microsoft 365 and want to keep a local copy of your Outlook data, you can export your mailbox from Outlook to a PST file. A PST file allows you to store emails, contacts, calendars, tasks, and other mailbox items on your computer.
To export your data, open Outlook and go to File > Open & Export > Import/Export. Select Export to...
To export your data, open Outlook and go to File > Open & Export > Import/Export. Select Export to...