Backups? Evidently not.
Here's a little light reading.
Thunderbird Profiles. Make a copy of your profile. Uninstall Thunderbird, then reinstall. Then copy your profile over to the new install. If the profile didn't get whacked then you should get your email back. And then you can regularly make a copy of this in the evet your hard drive should die, or your computer melts, or what ever.
ksg5000 wrote:
I have windows 10 with Thunderbird and the new update did not have adverse effect on me. Since your original emails should still reside on the original servers you might consider just reinstalling Thunderbird - might be a simple fix.
That assumes he's using IMAP and not a POP3 server. Oddly enough there's still a lot of POP3 out there.