All, I'm running an iPhone 4, iPad, and Macbook Pro (10.6.4) to grab mail from our recently upgraded Exchange 2010 Mail Server. The server was moved from 2003 just this past weekend. Up until this weekend, I was able to access the exchange server through my iPhone (3gs running iOS4 AND iPhone 4), iPad and MBP (using Entourage). After the update to 2010, I am able to access the exchange server through Apple Mail. However, I am now UNable to access the server on my iPhone 4, iPad or even entourage (which I tried just for kicks). I have reset the ipad and iphone 4. Deleted the account and set it up multiple times. No luck. I also tried this on my wife's iphone 4 which was never in anyway associated with my work exchange server. I have confirmed that at least one other co-worker is running his iPhone 4 with the recently upgraded server. To me this sounds like an individual account issue, but why would apple mail connect without trouble while iPhone 4 does not. Any help would be greatly appreciated.