Why do I not see "ActiveSync" service when trying to pair my AT&T Tilt PPC w/ my Dell Latitude XT Tablet PC?

I have been trying to sync (using MS ActiveSync 4.5) my AT&T Tilt PPC (Windows Mobile Professional 6.0) w/ my Dell Latitude XT Tablet PC using Bluetooth.  I can sync with USB no problem.  The PC has XP Pro SP3 installed along w/ Toshiba Bluetooth Stack.  I can pair the two devices using BT and can transfer files and such, but I cannot get Sync to work over BT.  The main problem is that when pairing, I do not see the "Activesync" service on the Tilt, only "Wireless Stereo" and "Serial Port".  I have looked and searched all over many forums for an answer and have come up with no solution, except to uninstall the Toshiba stack and reinstall MS BT Stack.  I would rather not do that step.  Does anyone have suggestions?