I am using a MacBook Pro 4,1 with 2 Intel processors. I am running OS 10.6.1. Ever since I installed Snow Leopard, my Mail app has misbehaved. It crashes routinely whenever I add an attachment. It never did this under 10.5. It also crashes occasionally when I save an attachment. Sometimes it appears to have taken the attachment, but when the message is sent, the attachment is corrupted. I think the only app I am having trouble with is Mail, although I think that Safari has crashed sometimes when a PDF file was downloaded. The problem seems to be associated with Snow Leopard. Should I try to do a clean install of Snow Leopard? Can I re-install only the mail app? How would I do this?