Calendar Problem

[Nolacenturion]

Got the EVO last Monday (7th). Entered in my Exchange Server Outlook account info. Everything synced right up, but I only use the Contact List and Calendar to sync.....the email goes to my city Blackberry. No need to get it on both devices. Today, for no reason I can fathom, Suddenly the calendar refuses to sync, giving me error messages like, SERVER SETTINGS HAVE CHANGED. CONTINUE AND ALL SYNCHRONIZED DATA WILL BE REMOVED.

When I unflag the Calendar in my Exchange Account, my 3,00+ Contacts sync , no problem. Check of the calendar box, it gives the error. And the Exchnage Server settings didn't change. they work fine on the Blackberry and Touch Po 2 (yes, I have three phones). Anyone know why the calendar went sideways, and how to fix it? I've tried several Calendar APPs, all the same result.