This security update contains fixes and quality improvements from KB5070311 (released December 1, 2025). The following summary outlines key issues addressed by this update.

This security update contains fixes and quality improvements from KB5070311 (released December 1, 2025). The following summary outlines key issues addressed by this update.

Description of the security update for Microsoft Exchange Server 2019 CU15: December 9, 2025 (KB5071875) File information File hash information ... Hashes for additional languages The hash tables for additional languages are available here: Hash tables for Exchange Server 2019 CU15 SU7 (KB5074993) - Download the hashes now Exchange Server file ...

Discusses the release of the Malicious Software Removal Tool (MSRT) to help remove specific prevalent malicious software from Windows-based computers.

Organizations enrolled in the Extended Security Update (ESU) program are eligible to receive the December 2025 security updates and all subsequent updates for Exchange Server 2016 and 2019. To continue receiving the latest security updates, organizations not enrolled in the ESU program should migrate to Exchange Server Subscription Edition (SE).

Hashes for additional languages The hash tables for additional languages are available here: Hash tables for Exchange Server 2016 CU23 SU21 (KB5074995) - Download the hashes now Exchange Server file information The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in ...

For more information, see Support for Exchange Server 2016 and Exchange Server 2019 ends. Organizations enrolled in the Extended Security Update (ESU) program are eligible to receive the December 2025 security updates and all subsequent updates for Exchange Server 2016 and 2019.

Type the name of the file appropriate for your device from the list below (for instance PrintMetadataTroubleshooterX86.exe) and then press Enter. The tool will return the message Troubleshooter completed successfully on devices where incorrect printer information was found/fixed.

Description of the security update for Microsoft Exchange Server Subscription Edition RTM: December 9, 2025 (KB5071876)

Note: To apply this security update, you must have the release version of Microsoft Office 2016 installed on the computer.