I recently bought a new (ok, a rather old ;-)) PDA, and I got used to the calendar and task features in Windows Mobile. Of course, I also wanted to synchronise all the tasks, appointments, contacts and files with my PC, but whatever I tried, it didn’t work somehow on my Ubuntu 9.04 machine… So, I’ve got it now: I had do blacklist the ipaq kernel module which wrongly handled the PDA when I plugged it in (i.  e. edit /etc/modprobe.d/blacklist.conf and insert the line blacklist ipaq), and then the manual from ubuntuusers.de suddenly worked like a charm :-)