Re: Mozilla awash with money IIRC
It's always been nearly impossible to get bugs fixed.
There are quite a few weird bugs in the IMAP implementation on top of the general slowness. One really nice one I ran into a few months ago happens when moving messages from IMAP to local, TB will create a zero-length record at the destination and then will delete the source. It turns out that bug has been around for years and years.
I've never really liked TB, but it's always seemed like the best of a set of exceptionally bad options. Why are email clients all such bags of rot?