Microsoft released the June 2018 quarterly Exchange updates today. In addition to fixing reported issues and adding functionality, the installation packages “include important changes to the pre-requisites required to install Exchange Server.” These are important changes to note, especially if you are planning an upgrade to Exchange 2016 or Exchange Online.
This release includes updates for three versions of Exchange: Exchange 2016 CU10, Exchange 2013 CU21, and Exchange 2010 SP3 RU22. Below are the most critical changes. See Microsoft’s announcement for full details about the release.
Exchange Server 2010 Service Pack 3 Update Rollup 22
This update finally introduces support for running Exchange 2010 with Windows 2016 domain controllers and Windows 2016 AD forest and domain functional levels. To be supported, all Exchange 2010 servers must be updated to Service Pack 3 Update Rollup 22 or later and all Windows 2016 domain controllers must be patched through the June 2018 Windows updates, at a minimum. This is an extremely important change if you are planning upgrades to Exchange 2016 or migrations to Exchange Online as well as an AD upgrade.
Exchange 2016 Cumulative Update 10
This update includes various functionality fixes and enforces the .NET Framework 4.7.1 requirement.
Exchange 2013 Cumulative Update 21
Significantly, this is the last planned cumulative update for Exchange 2013, as the product entered extended support in April 2018. You must upgrade to Cumulative Update 21 to receive future security updates and support. This change also enforces the .NET Framework 4.7.1 requirement.
As always, we are happy to answer any questions or concerns you may have about this important Exchange update.