A. Previous versions of Windows Mobile synchronized tasks between Exchange/Outlook and your mobile device, but as of its release, Windows Phone 7 doesn't support the synchronization of tasks. There are other solutions that work by synchronizing tasks from Outlook into a cloud-based task system, and then a Windows Phone 7 application syncs to the cloud copy.
One popular solution that has a Windows Phone 7 application is Remember the Milk, a paid service. Task synchronization support may be added in the future, but a paid service is certainly an option for today.