We're running Exchange Server 2003 SP2 and publishing OWA and Exchange ActiveSync through ISA. I just upgraded from ISA 2004 to ISA 2006 yesterday and since the upgrade, on my Windows Mobile device, every few hours I'm prompted to re-enter my credentials with "Please Correct Your Exchange Server Credentials". I can successfully enter my credentials when prompted and my device the successfully syncs for a few hours after which I'm prompted again. This didn't happen under ISA 2004; it just started happening yesterday under ISA 2006. How do I correct this?