Message Could Not Be Displayed Error in Windows Mail IN VISTA

Problem: Cannot open, move, or delete certain messages in Windows Mail [ When trying to open a message in Windows Mail, the error message Message could not be displayed is shown. If you try to delete or move the message, a dialog box appears stating An unknown error has occurred. ]

Solution: Delete the Windows Mail store folder

1. Restart the computer in safe mode.
2. Click on Start , type appdata, and then press then Enter.
The C:\Users\\appdata folder appears where is the account name assigned to the user currently logged into the system.
3. Double-click to open the Local, and then the Microsoft folder.
4. Delete the Windows Mail folder.
5. Clear the Recycle Bin.

Restart the computer in normal mode and reconfigure the windows Mail and that should do the Trick