I read that to import Outlook (I have 365) pst files I need 'downgrade' from Thunderbird 115 to Thunderbird v 38.1 . But that was an older post, so I am hoping there are now ways to import pst files directly into Thurderbird 115 (I have a lot, each with lots of e-mails). If not: 1) can I leave 115 on my computer and install v 38.1 in addition - import the outlook pst files into 38.1, store them as 'local files' on my hard drive and then connect those to 115 ? 2) Since I read something about installing v 38.1, importing the pst files (and presumably storing them as local files on the hard drive/external drive?) and then updating that to v 115, I suspect that 1) is not an option. 3) so next question is (haven't searched for that yet) : if I have to delete 115, I will have to re-connect all my local folders once I am upgraded again to 115. I have them all (a lot) stored on an external drive - is there guidance somewhere on how to get those 'recognized' all at the same time by Thunderbird 115 ? (Outlook is not very userfriendly in that regard, one needs to 'open' each pst file individually). 4) final question while I am at it: latest outlook version has limitation on the number of pst files one can have open at the same time - I found that out the hard way. Is there also a limitation on how many local folders one can have in thunderbird 115 ? THANKS A LOT in advance for your help (this is my second time asking for help and last time I got an e-mail with an absolutely perfect answer). Annette.