I have a few questions regarding the proper installation of a Unity 5.x voice messaging server when it will be installed into an existing AD that contains a single Unity 4.2 voice messaging server. The new 5.x server will also contain it's own version of Exchange.
1. Is it required to run ForestPrep and Domain prep since this will be the first Exchange 2003 server in the forest?
2. It is my understanding that the AD schema needs to be extended for the 5.x version of Unity. Does ADSchemaSetup need to be run from the Primary DC, or in this case the original Unity 4.2 server? Or can it be run from the server being installed?
3. I have some general questions about creating the mailstore. When installing a voice messaging server I normally use all the defaults. Is it OK to use the defaults in this case since there is already a mailstore with the same names, but under a different server?
Any other details regarding this type of installation would be helpful. Thanks.