I've gone through the adding procedure and it all verifies and looks good there. However, it will not receive or send any mail (nor sync up contacts/tasks, etc). It's just throwing the terribly uninformative "An error has ocurred" message. I'm running the latest iOS - 6.0.1 - on this iPad 2.
Thus far, I've tried deleting and re-adding Exchange on the iPad multiple times. I've gone into OWA to delete it from the mobile phones list there, but it's not in the list.
There are other people successfully connecting to the same Exchange server with their iPads.
What else should I be checking?