For a while now I’ve been tied into M$ Outlook because it is the only program M$ ActiveSync is willing to synchronise with (for my Windows Mobile 2003 PocketPC). Now I have FinchSync, which synchronises with the appropriate Mozilla programs (Thunderbird Address Book, Calendar Tasks and Appointments).
It works in the exact same way as ActiveSync – a program on your computer, a matching program on your PocketPC, which then talk to each other via a USB cable. It requires a bit of configuration, but nothing too difficult, it’s just a question of actually doing it. After that, you just make sure you have FinchSync.jar running on your computer (did I mention, it’s a Java program), and then run the FinchSync PocketPC app and click ‘Sync’. And that, as they say, is that.