UPDATE 2/12/21
The Exchange Sustained Engineering Team continued servicing all customer issues for Exchange 2016 that were opened with Microsoft by the end of Mainstream Support, which was Oct 13, ...
Updated Feb 12, 2021
Version 12.0
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LukasSMSFT , kindly guide plesae
This article states
"After June 15, 2021, only CU21 or its successors will receive updates" but we have received SU July for CU 20 as well.
We are at CU 19 and looking to apply July SU's which we know are only applicable to CU20 and CU 21.
We currently do have third party applications which have not yet announced support for CU 21 and we have registered support cases with them for a time line.
My point is if we go for CU 20 and apply July SU's then according t this article only CU 21 will get any future security updates, so should we target 21 or go with CU 20, because not looking to perform another CU update repeat in few days, hence looking for advise.
Can we have at least support End date for CU20 anywhere? As per documentation (n-1) rule, CU20 was released on March 16th and CU 21 released on June 29th , so CU 20 will be supported till 29th September 2021, please assist if this is correct prediction for support end date for CU 20. This will help us to make a decision for CU 20 because for 21 need to wait for support announcements from vendors e.g. backup sofware vendor etc.