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v91.2 auto-upgrade made POP saved emails and directory structure unaccessible

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mfb11
mfb11
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Hi-- Thunderbird auto-updated from v78.x to 91.2. I use POP and have a large folder structure with 15 GB of mail. v91.2 initially opened and functioned well, but eventually on this fully updated Win10 machine it stopped opening (there would be 4 Thunderbirds running in task manager, but nothing would appear on the screen). I tried starting offline, and also the other options of disabling addons and something like returning to defaults.

When I tried downloading v78.x again, that started to run, but told me that v91.2 had modified the profile and it would not work with v78.x

I'm guessing that my only option is to create a new profile and copy the .sbd directories, the .msf files and the other file with no extension to the new profile I've made. I've started to do that, and it all works.

Wondering if someone could explain to me what went wrong and if there are other options. What is so different about v90.x that it makes the profile unreadable by v78.x

Hi-- Thunderbird auto-updated from v78.x to 91.2. I use POP and have a large folder structure with 15 GB of mail. v91.2 initially opened and functioned well, but eventually on this fully updated Win10 machine it stopped opening (there would be 4 Thunderbirds running in task manager, but nothing would appear on the screen). I tried starting offline, and also the other options of disabling addons and something like returning to defaults. When I tried downloading v78.x again, that started to run, but told me that v91.2 had modified the profile and it would not work with v78.x I'm guessing that my only option is to create a new profile and copy the .sbd directories, the .msf files and the other file with no extension to the new profile I've made. I've started to do that, and it all works. Wondering if someone could explain to me what went wrong and if there are other options. What is so different about v90.x that it makes the profile unreadable by v78.x