If they want it to be taken seriously by the open source community, might as well start with mail clients used by the top contributors to things like the Linux kernel and core open source libraries used in most Linux distros. This is how to help ensure adoption and making it a replacement for IMAP.
"Ensure adoption" sounds so strong. I won't say I don't know mutt, but it just doesn't strike me as their best bang for buck, in terms of user base, does it? Would it not make more sense for them to invest in, dunno, say, Thunderbird?
