Hello all -
I found out there is an engineering change needed to digitally network Unity 4.x servers with 5.x. Once you upgrade your first 4.x server to 5.x, the other servers will not be able to share in the license pool unless ES116 has been applied. ES116 superceded ES86. I received the ES by contacting TAC. Note - only needed if your Unity servers are participating in license pooling.