Download Microsoft Exchange Server 2013 CU 23

Microsoft has already released the twenty-third Cumulative Update for Exchange Server 2013. Exchange Server 2013 was released in January 2013. Mainstream support from Microsoft will run until April 2018 and extended support will run until April 2023. Only security and time zone updates will be implemented during this extended period. For a general discussion about Exchange Server 2013, you can visit the General Exchange 2013 topic on our Forum. The KB article with number 4489622 mentions the following changes:

Cumulative Update 23 for Exchange Server 2013

This cumulative update includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2013. This update also includes new daylight saving time (DST) updates for Exchange Server 2013. For more information about DST, see Daylight Saving Time Help and Support Center.

Issues that this cumulative update fixes

This cumulative update fixes the following issues that are described in the following Microsoft Knowledge Base articles:

• 4502131 “TLS negotiation failed with error UnknownCredentials” error after updating TLSCertificateName on Office 365 send connector in Exchange Server 2013 hybrid environment
• 4503028 Description of the security update for Microsoft Exchange Server 2013 and 2010: June 11, 2019