Hi all. Googling my (similar) prob with the HTC Kaiser aka Vodafone 1615 aka TytnII I found this forum, so I registered.
My problem is that my MDA (USB)synced fine with WMDC on my Vista64 box, (TomTom, Outlook 2007 etc.etc.) until recently. No new installs, no new hardware, nothing.
But now it doesn't anymore.
I read all forums, threads and subjects on this challenge

and tried everything. My main impression is that WMDC has some (to say the least) bugs.
OK, what did I do?
1. I disengaged "advanced networking" in the USB connection settings on the Kaiser, this resulted that the Kaiser then showed itself as a "HTC USB device" in Vista's device manager under "Mobile devices"
2. I re-engaged "advanced networking" in the USB connection settings on the Kaiser, this resulted that the Kaiser showed itself as a "Microsoft Windows Mobile Remote Adapter" under "Network Adapters" in Vista's device manager.
But in both cases it didn't sync. Nor could i approach the Kaiser as a "Storage Device", which normally would work.
3. Re-installing WDMC (mobile_drvupdate-amd64.exe) didn't solve the problem either.
The last resort will be installingactive sync on a XT box, installing Outlook 2007 there too, exporting Agenda and Contacts form my Vista box to my XT Box and try syncing there.
So much for the modern marvels of personal digital assistance.
Any further suggestions will be highly appreciated.
knsm-eiland.