We have about 60 email users on our old hosted email system, and one by one I'm moving people to the new Zimbra server - so far we have maybe 10 using it. I'm trying to get people on Zimbra Desktop whenever possible but there are still holdouts using Outlook. On all users' desktops, I've noticed Outlook occasionally times out trying to Send/Receive, and it's quite annoying. I've increased the timeout to as high as it goes, but it STILL times out. Why should it time out at all when it's set to 10 minutes!?! The server is plenty powerful with plenty of RAM. I've tried increasing the maximum number of threads to 400 but that didn't help. If I want users to use our new system, it has to 'appear' that it's working properly.
Is there some sort of performance hack I can perform?