MC1199746 - Take Action: Out-of-band update to address MSMQ service issues leading to queue operations and resource-related errors

Microsoft has identified an issue affecting Message Queuing (MSMQ) functionality in some enterprise environments after installing the December 2025 Windows security update (released December 9, 2025). Individuals using Windows Home or Pro editions on personal devices are very unlikely to experience this issue, as it primarily affects enterprise or managed IT environments.

To address this issue, an out-of-band (OOB) update has been released, today, December 18, 2025, on the Microsoft Update Catalog. For more information and installation instructions, refer to the appropriate KB article for each affected version of Windows listed below. For additional guidance, see How to download updates from the Microsoft Update Catalog.