This is a change from earlier blog notes because it became clear that CU19 in December 2020, was too close the end of Mainstream Support to process all of the cases that came in by Oct 13th. The last planned CU for Exchange Server 2016, CU20, will be released in March 2021. With the transition of Exchange Server 2016 to Extended Support, the quarterly release schedule of cumulative updates (CU) will end. For Exchange Server 2016, Fixed Life Cycle will include any required product updates due to security and time zone definition changes. That’s just a few short months away.ĭuring Extended Support, products receive only updates defined as by the Fixed Life Cycle. 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.Īs hopefully many of you already know Exchange Server 2016 enters the Extended Support phase of its product lifecycle on October 14 th 2020. After June 15, 2021, only CU21 or its successors will receive updates. New cases are not being considered for CU21 this is only to complete our commitment to fix what was approved from the cases that were logged prior to the end of Mainstream Support. Microsoft encourages Exchange Server 2016 customers to adopt CU21 as soon as possible after it’s released in June, 2021 to ensure uninterrupted delivery of any future security related fixes. Therefore, we have decided to extend out one more CU and we will be shipping CU21 in June 2021. As such, not all fixes will be in the soon-to-be-shipped March update (CU20), as code stabilization and quality targets do not allow us to take changes that late in the shipping cycle. Some of these cases were being worked on by customers and Microsoft into the new year, with fixes being approved though the end of January. 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, 2020.
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