This probably doesn't help but, when I first moved to Ubuntu I tried Evolution
and then I moved back to Thunderbird. At the time I using the std mail box .mbox
but within about two weeks Thunderbird started seriously crashing - repeatedly.
Turns out I had moved beyond mbox limit of stability.

My thunderbird is whacking out, but not crashing. I'm running Gutsy, btw.

Must be a corrupt file or something - one of the add-ons/themes? I'm
also running TB and no problems on 7.04, 7.10 (which i'm still running
on one machine) or 8.04.

Update - I ran TB from the terminal to see if that would reveal anything
- and it did.

Segmentation fault.

So now what?

Many thanks to all who have replied so far and many thanks in advance
for any further help.

as a matter of interest,are you running SCIM? If so, you may find this post on
the forums interesting:ubuntuforums.org/showthread.php?t=423521Frank

SCIM is installed, but isn't activated in Language Support ('Enable
support to enter complex characters' is un-checked) and there's no sign
of it running in System Monitor. If I understand right, I don't
actually need SCIM unless I'm trying to input non-Roman characters,
correct? In which case, I could uninstall it, yes?

If yes, I'll uninstall and see if that makes a difference.

I would just un-install and download again.

I think I may have solved this by uninstalling thunderbird-beagle as I
haven't had a crash now for two days, where I used to have TB crash two
or three times a day before.

Bit of a bummer as I used beagle quite a bit for searching my emails.
Ho-hum!