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I have twenty years of history in various .pst files. When I first started using Outlook, my single .pst file and all my folders got too large and I was instructed to move some of my folders into new .pst files. These .pst files contain lots of important emails and historic records attached to emails. So I filed all the emails into various folders within various .pst files.
If Outlook will no longer support .pst files, how will I be able to access the .pst files? I understand that Microsoft will no longer support “Old Outlook”. So what can I now do to be able to access these various .pst files? Should i go back to what I was doing originally and move everything from .pst files into folders within my "root" Outlook email? That would put about 4.5G of emails into my New Outlook. How will that work?
Using New Outlook on Windows for personal email, calendar, and contact management
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
Forget about PST files. Change your 365 licenses to a Premium license and enable auto expanding archive. This allows your In-Place-Archive to expand up 1 TB Then import your old PST file back into your mailbox.
It is still there in my comment from 05-Apr-2025. That ends with me saying I'd done a web search and:
"That returned various hits including one at Coolutils Converter Blog titled
"8 Best Ways to Open a PST File Without Outlook in 2024"
The link to that is:
https://www.coolutils.com/blog/ways-to-open-pst-file-without-outlook/
I haven't tried any of the methods there yet but figured I'd share it here for others."
On pointing browser to that link today 29-Jun-2025 it still works. However, as noted I haven't tried any of the methods it suggests. I have a paid Office365 subscription so don't need to at this point.