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We started with SM Pro 7.x about 3 years ago. We just updated to SM Pro 13.2 a couple of months ago and we're having the exact same problem. Periodically, with no discernible pattern, and regardless of whether there's browser activity or not, browser sessions are lost with the following error showing on the screen: "Your web browser has lost the session with the server. Press OK to return to the login page." I know this is something that's happening at the server rather than at the browser. I've had two people her on separate computers lose sessions at the same moment. Also I've been on the phone with a client with both of us in webmail, and again both our browsers lose the session at the same moment. So I know it's a server thing. That question of course is, what's going on and how do we stop it.
Is anyone else experiencing this issue, and if so have any solutions been found? I have verified that IIS is configured just as SmarterTools instructs. I really like SmarterMail, but it's rather disappointing that this problem apparently has persisted through several major versions of the program.
Centennial, CO. U.S.A.