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https://www.wikihow.com/Import-a-PST-File-to-Thunderbird Seems a common method is creating a gmail account, connecting it to your outlook account via IMAP, getting all your outlook into gmail, then setting up gmail as an email account in Thunderbird to get the copy of outlook that you made in gmail, into thunderbird.

I had no real problem moving Thunderbird, Firefox, Vivaldi LibreOffice to W/11 and even did a clean install (due to this bug). However, I use Thunderbird portable as well as many copies of Firefox portable and a couple of Vivaldi stand-alone (I also have a copy of LibreOffice portable I can run concurrently with the normal install) on a separate partition or drive. I also save my user profile and migrate old files to the new install as needed. You do need to know what to look for.

Also, there are many safe free tweaker programs, as posted on here, by the grace of God.

To learn how to achieve all this (at link) and more on a Linux distro (Puppy is my favorite) would take me more time than is presently warranted.