Exchange 2010 Sp2 Error To Owa Login User The item can’t be opened because it’s become corrupted
If Uo Login Owa And This Error For Users The item can’t be opened because it’s become corrupted
“username” isn’t valid. Valid values are: Strings that includes ‘@’, where ‘@’ cannot be the last character
Fix This Problem
Login domain controller
Start>Run>Dsa.msc And Enter
Locate the user > Right click > Properties > Account Tab
Put the domain name in the domain section (UPN) And Done
