We have a client with about 130 AP4532, 4522 and 4762 outdoor AP's. I'd like to upgrade the controllers to NX5500's from WM3600's both to allow for newer firmware (I've tested recent firmware on the 4532's without incident) and for growth using newer AP's. We expect to add another 150-200 this year and I won't be able to expand the old controller. Does anyone know, can I move the licenses for the already owned AP's to the new controller pair and if so, are there any backward compatibility issues with the older APs (other than the 2-step upgrade process)? Thanks in advance!