Microsoft warns MSMQ may fail after update, breaking apps
MSMQ message sending can fail after KB5071546 because the update requires write access to C:\Windows\System32\MSMQ, a folder normally restricted to administrators.
Microsoft security updates breaks MSMQ on older Win systems
MSMQ fails on some Windows 10 and older Windows Server systems after the December 2025 security update due to NTFS permission changes requiring write access.
