Microsoft announces there is no major CU release for December 2021. Microsoft typically releases Cumulative Updates quarterly for Exchange Server 2019, 2016, and 2013.
There have been a number of critical Security Updates since the latest September 2021 CUs: see KB5007409, KB5007012.
For convenience, here are direct links to the Microsoft downloads for the latest Exchange versions:
- For KB5007409 details and downloads refer to this November article.
- For KB5007012 details and downloads refer to this October article.
Be sure to visit Messageware Security Products for Microsoft Exchange Server. All enterprises with Exchange Servers should add security that provides on-premise systems with logon intelligence and security controls protecting the most widely used Exchange Server services, including OWA / Outlook Web, ECP, Autodiscover, ActiveSync, EWS, OAB, MAPI, Outlook Anywhere. Critical additions for all enterprises including those who believe they are protected by multifactor authentication (MFA/2FA).