I am setting up our Exchange 2016 environment next to the existing 2010 one. I have 3 servers up and running with a couple test mailboxes working properly. Now I am at the point where I would have to put these servers in the load balancing along with the 2010 CAS servers, but here I have a problem.
There is one namespace that points to the load balancing address, mail.ourcompany.com. But the old CAS servers have Windows NLB as a load balancing solution, which is something 2016 doesn't want to play with. For quite a while now, we also have a hardware load balancer running but the 2010 CAS servers never made it to this machine, and so remained on their Windows NLB.
Would it be best to move the 2010 CAS servers to the hardware load balancer first with their namespace, and then add the new 2016 servers to that array? Or would it be possible to leave the CAS servers as they are, and only have the 2016 servers in the hardware load balancer, with the original namespace mail.ourcompany.com, acting as a kind of proxy to these 2010 CAS servers? Would that even work, having all users on 2010..?
Thanks for helping us out!