I dont think its a provisioning issue. I use non-provisional devices with no issues whatsoever on our Exchange 2007 server. My NOKIA E51 is a non-provisional device and works like a charm, but NOKIA N900 can not sync. The progress bar starts and never finishes without giving me a single error. iphone works, nokia E51 works, nokia E71 works with my server but NOT, I reapeat NOT, Nokia N900, and there are absolutely NOOOOOOOO excuses for that. Email is so essential, and NOKIA N900 fails in that