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.
That would likely only save the headers on your PC which is standard for Thunderbird. You have to make it to download everything. I don’t know if you have to make gmail pull more than just headers in. As data hungry as they are, I would suspect they pull it all in by default.
Linux is a little lacking for dedicated programs for PDF file creation.
Neither LibreOffice Writer or Calligra Words will Save As pdf.
Inkscape, a vector drawing program will Save As pdf.
GIMP, a photoshop like program will Export As pdf.
Both have Layers.
LibreOffice Draw will Export As pdf but is not as robust as the above two graphics programs.
There are also a few pdf utilities like PDF Slicer available. Plenty to merge as well.
I'll have to correct you on this. While I have zero experience with Calligra Words, I do know that LibreOffice Writer can save to PDF. It's under the File->Export As menu.
Thanks, I will look into this, but...
The picture book I maintain online is a mere 2,000 pages of multilayer pdf, as are two books, one comprising another 750 or so. These are of both historic, religious, and political significance. I can't depricate the quality of the product.
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.