Open your registry and find the key below.
Modify or create the DWORD value named "MessageExpiryDays" and set the value to "0"
to disable the count of unread messages to be displayed on the Welcome screen.
Key:[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\UnreadMail]
Value Name: MessageExpiryDays
Data Type: REG_DWORD
Data:(0 = disabled, 3 = Default)




