My mail 4.6 disappeared and now I can't open mail at all. This all happened after the most recent security download. I followed apples directions to fix the "can't open mail" problem and that's when mail 4.6 disappeared. Now I have no access to mail. I went back into time machine to see if I could find it in a backup and it's not there either. I'm not sure what is going on, but I need help. Can I download 4.6 somewhere?