I have a customer that is looking to upgrade their existing UCM 7.1 (2 nodes), Unity 7 (single server), UCCX 7.1 Premium (pub & sub), and UCCX AQM (all on MCS appliances) to 8.x versions (and Unity to UCxN). All the servers are located in one facility. They also would like to move to their own VM environment leveraging their own ESX host servers (the spec is confirmed to meet the 3000 different requirements for 3rd spec-based virtualization).
Understanding that several cutovers might be required, what will be the best way to do this while minimizing downtime and in what order?
Thanks in advance!!