I currently use Thunderbird 3 and Lightning 1.0b for my mail and calendaring tasks. But without any way of syncing them with my WM6 mobile device I need to start looking at what other alternatives I have.

Does the KDE Kontact (Address book, calendar, todo and mail) sync with wm6 devices? And if so how well? Does it support recurring tasks and appointments, birthdays, etc?

Everything seems to depend on opensync which looks like has stalled. I'd prefer not to move away from TB but if a good reliable solution can be found I may consider it.