I have a current license for unity 4.0, can the same license be used if I use Unity 4.1 or 4.2
Do you have Unity sofware application support plus upgrades for Unity - called SASU? Here is a link that discusses - http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2237/products_qanda_item09186a008009438f.shtml#qa3
If you have this support, you can download Unity from Cisco's site. You only would need to change the license when adding users, TTS or Unity ports, features etc. or when moving the Unity license file(s) to new server hardware.