Exchange 2016 is the latest version of Exchange, and it’s not very different compared to Exchange 2013. When it comes to requirements, there are some differences though:
- Domain Controllers need to be at Windows 2008 level;
- Domain Functional Level (DFL) and Forest Functional level need to be at Windows 2008 level;
- The Exchange servers themselves need to be running Windows 2012 or Windows 2012 R2. At the time of release Windows Server 10 is not supported.
There’s also something like Simplified Architecture. This is the Exchange 2013 Preferred Architecture, enforced on Exchange 2016. This means that there will be only one Exchange 2016 server role on the internal network, the Exchange 2016 Mailbox server. This is the same as the old Exchange 2013 multi-role server, but at this moment there’s no choice left. You have to install the Exchange 2016 Mailbox server, and you cannot opt to install a dedicated Client Access server anymore.
Jaap Wesselius 
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