About once or twice a week, my outgoing mail crashes on Exchange 2007 (on a SBS 2008 Server), and no mail can go out. I have 8 Exchange users on this network. I used to reboot the server to fix it. Now through trial and error (mostly error) I have found if I restart the DNS Server service, and then the Microsoft Exchange Information Store, this solves the problem. But I have no idea why. At first I thought it was my Avast SBS anti-virus program (because I had to restart that service too) and it was happening almost every day. So I switched to Trend Micro Worry Free and the problem only occurs once or twice a week now. But of course that is once or twice too much. Please help, people are getting really frustrated.