In a few weeks I have to migrate an EV cluster (2008 R2) in 10.0.2 to EV 12.
I know that you cannot "just" upgrade like that and that EV12 cannot be installed on W2K8R2 but on a WS2012/R2. No problem at all for this.
My main problem (if we can say that is a problem) is the add in.
As the company is on his way to migrate to exchange 2016 and O365, I was asking myself: can I use the EV12x in O2016 vO365 with EV 11?
I brief, I was planning to do it like that
That's in 'raw' how I woudl do it. Just that add-in question that remains.
I already checked all of that :)
My main concern was the add-in not working with an oldest version of the server.
I already had the problem that an add-in in 10.02 was not working with an ev server in 10.0.4
So yes, I prefer asking now and get an answer like: the add-in for v12 will not work with a server in v11. or a yes, it will work.
Safety first :)
Anyway, thanks for your reply.