I have just upgraded from OSX 10.3.9 to 10.4.11 and every time I try to recieve new mail, it crashes. When asked to reopen, it crashes again. Following this, I choose 'try again' button, and it prompts me to refill in my information. Once complete it again goes into a circle of crashing. Can anyone help me? Runing PPC G4 OSX 10.4.11 1.25GHz, 512MB ram.