Microsoft to End Security Updates for Exchange Server 2016 and 2019 in October

Microsoft will discontinue security updates for Exchange Server 2016 and 2019 through the Extended Security Update (ESU) program in October. The announcement applies to customers enrolled in the ESU program, which provides critical security patches for end-of-life software. No specific date within October or additional technical details, such as CVE IDs, were provided in the notice. The cessation of updates may leave unpatched systems vulnerable to exploits targeting known or future vulnerabilities. The decision affects organizations still relying on these Exchange versions for email and collaboration services.