I've also managed to sync contacts, calendar and tasks of Windows Mobile 6.5 HTC PDA with Ubuntu 9.10
How to sync Evolution contacts with PDA (Windows Mobile) in Ubuntu 9.10

Another solution for syncing contacts is by syncing them with Google sync. It uses MS Exchange server for syncing contacts.

The only problem I have is that I can't use my computer's Internet from my mobile phone. It worked just fine in Windows XP.