[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Outlook Express
Change/Create the Value Name [No Modify Accts] in accordance with the Value Data listed below.
Data Type: REG_DWORD [Dword Value] // Value Name: No Modify Accts
Value Data: [0 - May Be Modified / 1 - No Modifications Allowed]
Exit Registry. Reboot.