As Fusion has said, get Tweak UI. When you've got it, click on the + next to "Logon", then on "Unread Mail" and make sure that "Show unread mail on Welcome screen" is unticked, click "Apply" and "OK". You can do this just for yourself or for all users on your PC.
Madeline.
-------------------- "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.