I can bring the snarky with the best of them, but that was not it.
That was a serious question, and, again, prospective paying customer here.
I'll say *prospective* one more time, since I don't think it's getting across.
I won't be paying for the code, clearly, I'll be paying for the company.
I need a mail program to *be a mail program*, and so far, *lots* of stuff I usually don't even bother to think about a) just isn't there and b) no one seems to care that it's not.
That troubles me a *lot*.
Stuff like proper threading, proper quoting and attribution, mailing list handling, reasonably handling of plaintext mail, and the like is stuff that is just not optional to me in an MUA, and I move a *lot* of mail -- 3-400 messages a day.
The backend of Zimbra may come from the "best FOSS traditions", but the more I look at the web client, the more it looks like it was feature-designed by people who grew up with Outhouse and Outhouse Exploit, rather than Mutt, and that's a mindset that I just can't cope with well.