Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello Quintao,
Good day to you and thanks for your post in Microsoft community.
Based on official article, PST file not supports in New Outlook for Windows, it's updated in coming soon list. You can find the same information under "Support for Key Outlook features" from Getting started with the new Outlook for Windows - Microsoft Support.
New Outlook for windows is still under production, so many features are not working or still under development, if you have any suggestion for New Outlook for Windows, it's suggested to share feedback by select Help and choose Support or Feedback. At this point, your kind cooperation will be highly appreciated.
Thank you so much for your precious time. Stay safe and healthy.
Sincerely,
Ankita Vaidya