I have upgraded from 5.1.3 to version 7.0.2. so far so good only issue is that I have lost quite a few DLUs. As this is a test environment not an issue yet but I will be upgrading the live system in two weeks time. I had a look around on the forum and it appears to be that this is because devices were not registered at the time of upgrade. I carry quite a few spare phones and have quite a few instances of communicator for users that travel. Bar plugging in all the device what is the best way round this. Does the device only have to be configured but not registered on the system or does it need to be registered and as such powered up during the upgrade.