Microsoft has confirmed that the December 2025 security updates are breaking Message Queuing (MSMQ) functionality, affecting enterprise applications and Internet Information Services (IIS) websites.

Microsoft has hustled out an out-of-band update to address a Message Queuing issue introduced by the December 2025 update.… The patches, released for Windows 10 22H2 ESU, Windows 10 Enterprise LTSC ...

The Windows updates from Microsoft's December Patchday have unintended side effects. Due to changes introduced by them, message queuing (MSMQ) in Windows 10, as well ...