We upgraded to 7719 last Monday (a week ago) and the server crashed on Thursday. Getting lots of memory warning emails today, and SM is hovering between 80% and 85%. CPU usage is bouncing from floor to ceiling like a roller coaster several times per minute. We have 24GB RAM on the VM. Looks like I'll have to upgrade that significantly, which is fine, since we host about 420 mailboxes in about 140 domains (which is a guess, since SM doesn't show those numbers on the main domain screen anymore). I'll also start limiting attachment sizes, and maybe turn off Greylisting?
Last November we had a user with a corrupt mailbox file (GRP file?) and it took the server down at least twice a day until we moved the install to a new server (inside a VM), upgraded to 7699 (December version), and instructed the user to remove his account from Outlook and re-add it. I know that's not what's going on here, but for future researchers, corrupted mailboxes can play havoc on SM CPU and memory usage.
Mik MullerMontague WebWorks