Cumulative Update 23 for Exchange 2013 is now available. It contains 1 documented security update and 1 additional documented new fix or improvement, as well as all previously released fixes and security updates for Exchange 2013 and the latest DST updates. Note that mainstream support for Exchange 2013 has ended in April 2018.
- KB4502131: “TLS negotiation failed with error UnknownCredentials” error after updating TLSCertificateName on Office 365 send connector in Exchange Server 2013 hybrid environment
- KB4503028 which discusses ADV190018: Microsoft Exchange Server Defense in Depth Update. This update was released separately for CU22 as well.
This release includes no new updates to the Active Directory Schema.
Download: Cumulative Update 23 for Exchange Server 2013 (KB4489622)
Download: Exchange Server 2013 CU23 UM Language Packs
View: Description of Cumulative Update 23 for Exchange Server 2013
View: Blog post of the Exchange Team about CU23 for Exchange Server 2013