I will keep you updated how the return goes, since knowing NOKIA, they will likely deny the return of my N900. Unfortunately, despite liking the device, I can not connect to my Exchange 2007, due to non provisioning in this device. Without email, N900 is useless to me. Here is what I sent to the customer service:

"I want to return my Nokia N900. Although advertised as having corporate email capabilities, I can not connect to my work email. The problem is that NOKIA N900 does not provide provisioning! I have had no problems connecting to my work with Nokia e51, e71 and e61. I therefore want full refund for the money I spent on this device"

Wish me luck that NOKIA will take it back