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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
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If your Outlook supports modern authentication, reconfigure your Outlook classic/desktop app to use Exchange type connection to access your mailbox. You can still open the PST file using Outlook classic/desktop app AND access your mailbox at the same time.
I have Outlook 2013, which I presume does not support the modern authentication?
No it does not. You can still use it to open archived PST files. Just can't use it to access your mailbox anymore.
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You can setup Outlook 2013 to run without an email account, look here: