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Corrupt mailbox in Thunderbird

I have a client who uses the Thunderbird email client.  It appears that one of the mailboxes/email addresses is corrupt.  When he tries to read email in that mailbox Thunderbird crashes.  However, this doesn't happen with any of the other mailboxes/addresses.  

I think I'm going to delete the mailbox/address and re-add it but wanted to make sure the email currently there won't disappear.  And, is there a way to re-sync the old emails to the newly setup address.

From my reading about it it seems that that is possible since there are separate files for each mailbox/address.

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8/22/2022 - Mon

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I *believe* it's when any of the folders for the particular address are opened.  I'm verifying that.  

I'm used to Outlook's .PST file which contains all data for all email addresses used in Outlook.  From my reading it appears that Thunderbird, wisely, has separate files for each address.  Correct?  

TB has a separate physical file for each folder within each address. Each address's mail folders/files is stored in a different Windows folder. (The terminology gets confusing, because "folder" means something different inside TB and at the Windows system level.)

If you're having a problem with all the mail folders for an address, I'd suggest deleting all the .msf files for that email address.

FYI: It's only when the inbox is opened, not when the sent folder, etc. are opened.  

Still the same fix?
Your help has saved me hundreds of hours of internet surfing.

Yes, I'd suggest the fix in my first comment, looking at just that one folder. Close TB, make a copy of the Inbox file (the one with no extension in the name), delete the Inbox.msf file, reopen TB, and see if that fixes it. If not, right-click on Inbox and choose Compact. If that doesn't work, how big is the file (size in My Computer/Windows Explorer)?

In the absence of any further response from the poster, I would suggest deleting the question. There's no way to know if my suggestion will be successful.

Please forgive my tardiness in updating the question!!

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