Thunderbirdベースのパーソナルツール Spicebird

http://www.spicebird.com/

Spicebird provides integrated email, calendaring and instant messaging with intuitive user interface. It runs on Windows and Linux and can connect to any standards based email and calendar servers that support IMAP, POP, Caldav protocols.

めも
gmail,google カレンダー,google talk等が使えるらしい。

参考
http://mozilla-remix.seesaa.net/article/78429871.html