Exporting contacts from Office 365 to Outlook can be done manually by following these steps:

1. Log in to Office 365.
2. Open “Outlook” or “Mail” app.
3. Click “People” or “Contacts” in the lower-left navigation.
4. Select contacts (Ctrl + click or Ctrl + A).
5. Use “Manage” menu to “Export contacts.”
6. Choose CSV or VCF format.
7. Save the file on your computer.
8. Open Outlook.
9. Go to “File” > “Open & Export” > “Import/Export.”
10. Select “Import from another program or file.”
11. Choose “Comma Separated Values” and locate CSV file.
12. Select destination folder (usually Contacts).
13. Map fields if needed.
14. Complete prompts and click “Finish.”
15. Verify imported contacts in Outlook.

To read this all steps clearly follow this blog: Expert Guide to Export Contacts from Office 365 to Outlook