I would like to verify there are no issues related to adding a Unity 5.x voice messaging (not Unified) server to an existing AD domain with a Unity 4.2 voice messaging server. The 4.2 server is in production and the 5.x server is new. From what I can tell, the only requirement is that ADSchemaSetup.exe needs to be run from the Unity server that's at the latest release (5.x in this case). Are there any other items of concern or things to take note of? Thanks in advance.