Microsoft has fixed the IIS crash that caused problems for Windows 2016 DAG members in Exchange 2016 CU4. Exchange 2013 also gets its quarterly overhaul of fixes in CU15.
Exchange 2016 CU3 is the first version to support Windows 2016 as a deployment platform. At least, it was. Microsoft has discovered a problem lurking deep in the bowels of Windows 2016 that causes Exchange 2016 CU3 to crash when deployed in a database availability group (DAG). IIS is tagged as the problem child, but it’s really not.
With all the focus and attention paid to Office 365, you’d be forgiven for assuming that not much happens in the world of on-premises software. Microsoft will support Exchange 2016 until 2025 and has to maintain the software through patches and updates until then. Exchange 2013 isn’t forgotten either. New cumulative updates are available for the two servers. Cue excitement all round.