since using my new mail system Zimbra, I Must say I’m very impressed. The web client is actually so good that I now use it more than Apples built in mail that I’ve used forever. But until it’s time to migrate this setup to work I need to run it a bit more and also try to restore a backup. I can’t use the standard backup because thats not included in the open source addition. I also need to read up on the performance of it. Using it at home with 5 users really does not give a good indication on how much processing power needed for 45 users. Theres also two ways of doing the install, one is to install everything on one machine, another to split up the work to several servers. It does seem to be a problem to upgrade a single server to multi-server so I need to get it right from the beginning.