This is within the realm of what I was expecting. So I might be safe (relatively speaking) by telling our users that they should expect a 5 hour downtime in order to fully perform the update...?
As for our 7280's, they should be able to operate as they have been, correct (by using the DTM to synchronize). I don't suppose there is an easy way to tell from the BES server who has the 4.0 OS, eh? That might be stretching my luck, right?
Thanks for the responses,