Since this article was written Sublime 2 has been released, which is an awesome editor that is far superior to TextMate.

Thunderbird can be difficult to get going with Exchange. A lot of Exchange servers do not have IMAP enabled. The only email client that exclusively uses Exchange Web Services (EWS) API and not IMAP is Hiri. www.hiri.com

Have to agree Wunderlist is the best one that I’ve used on Mac and I’ve tried lots.