yeah, i spent 6 hours messing with exactly that last night. I removed wmdc, all the adapters etc. that vista installs in the device manager for it etc. I finally got it to sync after a fresh flash at 5:45am and then got called into work at 10am
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I think part of vista's issues stems from the diamonds ability to connect as a drive as I'm not sure i had the activesync issue until after copying a bunch of files to the internal storage. Regardless of the sync issues as annoying as they are I can live with them. Its the rom issues that kill me. I can't imagine why after a random amount of time passes that I can no longer install cab files on the device. I keep 5 or 6 things on internal storage that i install after a flash and if I don't install them immediately I can't unless I reflash.
The same thing with alarms. I managed to set an alarm to wake me up for work this morning but it never went off. I can't unset it either. TF3D shows it as set. I even disabled TF3d and unchecked the alarm from the control panel app and it won't stay unchecked. Its like something went read/only on the device. I can still add weather cities, contact favorites etc. Its just these few mysterious issues that plague me. If it hadn't happened across 2 different diamonds I would think it was the phone.
That and flashing back to stock gets rid of the issues I think.. I'll test.
OK, the stock rom on the old phone connects right up and wants to sync. Now connected as a drive and it opens the folder up. Now the kicker, back to activesync... and it wants to sync again. So much for that idea. The stock ROM works just dandy and that was flashed from this computer back to the old phone.
Update:
I can connect the phone in disk drive mode every time and it works fine. Its almost as if the phone's activesync isn't requesting a sync once its attached. The computer knows its there as vista shows the connection in the device manager. This is actually keeping me from unlocking the new diamond again. I had relocked it on the wild off chance that the bootloader was the issues as I'd tried just about everything else. I wonder if the newer roms have a different version of whatever comm manager HTC uses that's causing the activesync issues.