This is a duplicate thread. I already answered your question in the Unified Communications section. Please note that we all check most every category so there is no need for double posts - in fact, it only causes confusion. Here is the answer to your question:
You will build your new Unity 7 servers as a new install and get them integrated into AD and with Exchange 2007. I assume if you have 2 Unity servers, you're going to run them as failover so yes - configure them for failover. The installation guide steps thru this process to a tee.
From there, you will use COBRAS and the GSM tool to move data from the Unity 5 server over to the new Unity 7 servers. You can read up on COBRAS at www.ciscounitytools.com. Essentially you will run a COBRAS Export on your Unity 5 server (you do not need to migrate messages in a UM environment). Since you have Exchange 2007, you will need to make sure you go ahead and import all of the users into the Unity 7 system in advance of the migration as well. Then before you import the data to the new Unity 7 system, you will use GSM to clean up the subscriber association to the old Unity 5 server on the AD user objects by "moving" them using the GSM tool to the new Unity 7 server. From there, you run a COBRAS Import and overwrite the Subscriber data (this will restore their setttings from the Unity 5x system) and all Call Handlers and other objects you migrate. You will need to read the Help file for the GSM tool so you configure communication between the Unity 5 and Unity 7 systems in order to perform the move properly. It's not a bad migration at all. The longest part is building Unity 7 out on the new servers.
If you have further questions, let me know.
Hailey
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