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At the risk of sounding like a 20 gripes with Thunderbird I must say its only just usable.

I use Thunderbird on GMAIL for most of my non-business computers and frankly its pathetic. If I sort the inbox by "Subject" I can't jump by pressing a key like I can in Outlook. I can't figure out how to get it to move to the next messsage, not the "next unread" message. Ok when going forwards but when going back? It keeps asking be if I want to read un-read e-mails in gmail's "all mail" folder when they just haven't yet synced.

I am so desperate for an Outlook replacment that I have thought about writing my own....