For the past couple weeks, I have had an error appear anytime I go to the inbox. It would just prevent me from downloading any new e-mails in the inbox. I didn’t know why it was happening, just figured Gmail was having some problems. After I heard from people that Gmail was working fine for them, I thought it was probably my profile in Thunderbird.
I didn’t get around to cleaning up my profile and just today thought I would look at my Inbox properties. In the General Information tab, there is a button that says Rebuild Index. I’ve never known what this button does, but thought I would just click on it and see what happens.
Do you know what happened? All of my e-mails in my inbox were downloaded from Gmail!
So, if you ever have problems with your inbox (or other folders), try rebuilding the index to repair whatever is broken.