Cat, I have selected TB as my default mail client. Nick, I do not have any accounts in mail. I did, but I got rid of them when I started having this problem. One cannot delete the Mail app. You get a message saying it is needed by the system. I tried moving it to the desktop, but only an alias goes there. I did zip it, but the original mail app stays there too. It doesn't disappear like other items I zip do. Confusing to say the least. Allan Rube' Nashua, NH www.nebirds.com www.allanrube.com On 11/3/11 6:01 PM, Nick Scalise wrote: > If it is opening seemingly on its own, I am going to guess that > something else is trying to open it. > > Like a calendar trying to send alerts or something like that. Maybe > even a ToDo in Mail? > > Do you have any of that going on? > > On Thu, Nov 3, 2011 at 7:50 AM, Allan Rube<arube570 at gmail.com> wrote: >> I use Thunderbird, not Mail. Since upgrading to 10.7.2, Mail keeps opening. >> In the preferences I selected TB as my default mail application. I have not >> entered any addresses in mail either. However, it stills opens every few >> hours. I cannot delete Mail, any ideas as to what I am doing wrong?