Active Sync 4.1. This had worked since I had my phone and gone through the ROM upgrade, but 3-5 weeks ago, this started popping up. I connect through a USB cable only, no dock, and connect maybe 1-2 times during the day and then all night long (I travel heaviliy, so my computer is my ipso facto charger). Before it fluked into sync today, it had been 5 days since the last successful sync.