Today we are announcing the availability of quarterly Cumulative Updates (CUs) for Exchange Server 2016 and Exchange Server 2019. These CUs include fixes for customer reported issues, all previously ...
Updated Nov 11, 2021
Version 5.0
Blog Post
Hi Nino, I just wanted to clarify which CUs are supported as the support policy for Exchange server stipulates:
Critical product updates are packages that address a Microsoft-released security bulletin or that contain a change in time zone definitions. When in Mainstream Support, critical product updates are released as needed on a monthly basis for the most recently released CU and for the immediately previous CU. When in Extended Support, critical product updates are released as needed on a monthly basis for only the most recently released CU.
This was also stated again in this blog post about the end of Mainstream Support for Exchange 2016:
https://techcommunity.microsoft.com/t5/exchange-team-blog/exchange-server-2016-and-the-end-of-mainstream-support/ba-p/1574110
Microsoft encourages Exchange Server 2016 customers to adopt CU20 as soon as possible to ensure uninterrupted delivery of any future security related fixes. After March 16, 2021, only CU20 or its successors will receive updates. During the Extended Support phase, only the latest CU is eligible to receive updates once the standard 3 month transition period of the prior CU has lapsed.
That is on this blog so is official information! Exchange 2016 has been in Extended Support since last October. Can you please ensure that when any future 2016 CUs are released (assuming any are) that you explicitly clarify which will receive critical updates.