Unknown to me Microsoft ditched POP3 recently. I have a large 22gb Outlook .pst file with important historical data for volunteer run non-profits. Using Outlook for 15 years or more. Outlook 2021 that was working stopped suddenly and now only uses IMAP. IMAP and 22gb chokes and is unnecessary as synchronisation not required or desired -or the expense of Microsoft Onedrive excess storage fees.

Can Thunderbird import this large .PST and can it connect to Telus in some way like it used to and that does not invoke IMAP? In other words everything local? Thanks!