Export emails using a PST file (with stud.unilu.ch email address)
Exporting or backing up emails, contacts and calendar items
If you would like to back up your email data before the end of your studies, you can do this with the desktop version Outlook for M365.
You can find instructions including a video directly from Microsoft at the following address Export emails, contacts, and calendar items to Outlook using a .pst file - Microsoft Support