I am upgrading my Exchange 2003 environment to Exchange 2010. I have Unity 4.2 with about 340 subscribers integrated into Exchange 2003.
I have successfully installed Clean install of Unity 7.02.ES with Exchange 2010 in my lab according to the recently posted installation guide.
There are multiple tools available that I can use ie. DiRT, COBRAS and GSM.
I just need to know what is the recommended best practice to move my subscribers along with voice messages, greetings, etc.. from my Unity 4.2 running in parallel with my new Unity 7 in production after the migration from Exchange 2003 to Exchange 2010.