When I add my corporate EAS account to my DK28 Epic I'm getting this alert "Security Policy restricts use of external SD" which if I accept dismounts my SD card. If I delete the EAS account I can used the card again. I know this isn't being enforced by me company. Anyone else having this issue?
Try the app touchdown. They have a 30 day free trial. The app detects the security settings pushed from the server and tells you what they are! See if THAT lists External SD cards not being supported. Yeah Touchdown is expensive, but it's so good it's worth the dough. Way better than Galaxy S Exchange support with Froyo I'm sure.