We have a customer that has unity 4 server running with exchange, no failover. They are moving to two unity server clusters on new servers unity 8. My question is that throughout the migration phase can we have all unity servers working in parallel.
My concern is the AD since i will have to run the ADschema to extend the AD for the new servers however will this affect the old server, i know it is backward compatible but can someone confirm that this can be done with no issues.
Also the exchange aspect can two unity servers accessed the same exchange server at the same time for testing purposes?
Therotically all the live users will exist on the same CSS on call manager but if i am integrating with call manager with the new unity servers i will be using a different css for testing. Ports will be assigned to on a different line group.
Will this work in parallel with no issues?