It is quite easy to sync your contacts, calendar, tasks, and emails between Windows Mobile Pocket Outlook on your phone and Office Outlook on your PC using Microsoft ActiveSync. However, ActiveSync doesn’t help if you use Thunderbird or Sunbird on your PC and not Microsoft Outlook.
That is when BirdieSync helps you out. It syncs all Pocket Outlook contacts, emails, calendar, and tasks using ActiveSync. The synchronization happens automatically as soon as you connect your mobile to your computer. The most recent changes on any device you sync are synced to the other devices. This ensures that everything is in sync on all devices. It also supports the synchronization with WebDAV, calDAV and WCAP remote calendars.
You can try the trial version available with full functionality for 21 days before you buy the program. Read more details and the system requirements on the main website.