159.0 (64-bit) update zapped my email account (gmail)

BTW, follow-up -- I tried to use system restore from the 3 most recent restore points to fix the problem -- no joy. :(

- Please describe "zapped" - is nothing left? No folders?

- Did you have anything stored in Local Folders, and are they still there?

- From your mention of "System Restore", can I assume you're using Windows?

- Did you originally install Thunderbird from an installer downloaded from the official site (<https://www.thunderbird.net/en-US/thunderbird/all/>) or from the Microsoft or other "store">?

- Did you update it from within Thunderbird, or did you update it from a store, or did you download an installer?

- Do you have other email accounts set up in Thunderbird and are they intact?

In order (or at least attempting to [grin]):

1 & 2: A quick (i.e., very, not extremely thorough) search in the app showed none of the previously existing settings for my gmail account. I'm going to extend it to the PC's SSD tonight if I have the time. (My email account should duplicate on my C drive & the IMAP server.)

3: Yes, as noted I'm on 64-bit T'bird & 64-bit Windows (11)

4 & 5: Initial install & all subsequent updates have always been from & within Mozilla apps, not M$oft or other sources. I'm on the TB release channel & always update from "about Thunderbird." [The reason I put it that specifically is that for Firefox I've been a beta since before its first street release. :) All my Mozilla updates are always from them directly. ]

6: I do have one additional gmail account, but it's low-traffic & seldom used, so web-only, not integrated into TB.

I may use safe mode & try to troubleshoot tonight if I can't find my account info/settings on my local drive.