Is the separate October Exchange Server security update responsible?
Microsoft says the reported instability is related to the October Windows updates, not the separate Exchange Server security update. The Exchange team's advisory should be checked for the affected Windows KBs and current mitigation status.
Answered in
Exchange Symptoms After October Windows Updates: Microsoft's GuidanceMicrosoft links Exchange symptoms to October Windows updates, rules out the separate Exchange update, and warns against uninstalling patches.
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