Hi, We're using Exchange 5.5 with Blackberry running on a separate server. But you don't have to get a "real" server to run Blackberry (depending on the # of users). We're running it on a small Dell Optiplex workstation with 512MB RAM. It also runs a couple of other minor apps such as Compaq Insight Manager console. No problems so far. LHarris lh@xxxxxxxxxxxx