Exchange 2016 CU3 has been released to the Microsoft download centre! Exchange 2016 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously. CUs are a complete installation of Exchange 2016 and can be used to install a fresh server or to update a previously installed one. Exchange 2013 has the same servicing methodology. Microsoft Exchange Server CU3 was released on 09/20/2016
Windows Server 2016 support is now available with Exchange Server 2016 Cumulative Update 3. Customers looking to deploy Windows Server 2016 in their Exchange environments require Exchange Server 2016 Cumulative Update 3 or later.
Domain Controllers running Windows Server 2016 are now also supported. Provided Forest Functional Level is Windows Server 2008R2 or later. Exchange does not currently support any new functionality provided by the updated operating system except for improved restart support in the Windows Installer.