Outlook cannot export your emails, folders, etc. directly from the Outlook Web App to a .pst file, but you can export to a CSV file. To export a .pst file from your company email, you must use a desktop email client. The Outlook desktop app is the easiest way to export for an O365/Outlook email address.
Exporting a .pst File
To export a .pst file from the Outlook desktop app:
- Click File at the top left of the screen.
- Select Open & Export.
- Choose the Open Outlook Data File option to download a .pst file.