I received my n900 in the mail yesterday and I am sorry to say that I have had the same problem with my exchange server setup. It keeps saying error in communicating with server. It does not matter if i choose a secure or unsecure connection. I have never had this problem earlier with my n97 or for that matter the iphone or the G1 that i have owned. Some advice or information from Nokia/Maemo would be helpful before they get flooded with complaints over the next couple of weeks.