We currently have 17 sites running 9.3.29. We are trying to get them all upgrade to 5.0. Here is the problem each site has 2 controllers. 1 controller uses a IVR that is not compatible with any of 4.0 releases. We have worked with the vendor and have 5.0 working. Mitel is suggesting we can bo a back up and then restore to a different controller ( we have 4 MXE's in our lab) then upgrade the controllers all the way to 5 then do a back up and a fresh install on the original controllers to 5.0 and do a restore. One of my concerns is if we dont have the same licenses on our lab controllers what will it do? Say I have 30 user licenses in the lab and 100 on the controller I need to upgrade will it keep the 100 users or will it delete them after the 30 licenses are used? Any ideas would be greatly appreciated. We are trying to do this as effectively as possible so we dont have the sites down a long time to try to do upgrades on both controllers from 9. to 5.