Keeping email flowing is one of the primary purposes of an email server, so the November 2024 Security Update problem was embarrassing, and it forced Microsoft to halt the rollout as it addressed the technical glitch.
A cynic might suggest that none of this would have been necessary if Microsoft hadn't released a security update that broke transport rules in Exchange so severely that it had to stop the rollout to fix the code.
Microsoft did not explain precisely what it fixed, only that 'the re-released SUs resolve this issue.'
The buggy update was particularly problematic for users with transport or data loss protection (DLP) rules configured as these could stop working after installation, requiring a service restart.
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