New Exchange Updates (September 2017)

On September 19th, Microsoft released the latest round of quarterly updates for Exchange 2013 and 2016.

Exchange Server 2016 Cumulative Update 7, KB4018115
Exchange Server 2013 Cumulative Update 18, KB4022631

.Net 4.7 support update: .Net 4.7 is still not officially supported with the latest CUs. Microsoft will be releasing .Net 4.7.1 in the near future and the Exchange team has stated that the December Exchange updates (presumably CU8 and CU19)  will include support for .Net 4.7.1, and that the updates scheduled for June 2018 will set .Net 4.7.1 as a requirement for both Exchange 2013 and 2016.

Exchange 2016 CU7 update highlights

  • This update requires a forest functional level of 2008 R2.
  • Fixes an issue where the message “Update UseDatabaseQuotaDefaults to false” is presented when changing settings on a user mailbox.
  • Fixes the issue of receiving a corrupted attachment when the message was sent from Outlook that connects to Exchange in cache mode.
  • Includes security updates.

CU7 DOES include updates to the Active Directory Schema.

Exchange 2013 CU18 update highlights

  • Fixes an issue where a new health monitoring mailbox was created with the Health Manger service is restarted after failing over DBs to a new server.
  • Fixes the same corrupted attachment issue mentioned with Exchange 2016.
  • Fixes an issue where using OAuth authorization for ActiveSync causes synchronization failure.
  • Includes security updates.

CU17 DOES NOT include updates to the Active Directory Schema.

And as always, remember to test these CU’s in a test environment before applying them to your production servers. It’s best practice and really the only good way to limit the possible headaches that Exchange updates can cause.