We're trying to implement a fall back for our exchange server to a Virtual server. I can get our server up on the virtual machine in a test environment and it all works but I was wondering is there any type of tool to tell me if this VM session will work for 10 users 50? Is there anything I can run to simulate that. I can't run the VM during the day if it could effect operations and need someway of testing. I found some Microsoft utilities like loadgen and jetstress. one on;y works on 2007 and newer and the other is giving me some sort of instance error.