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Another reported symptom is growing email queues. Installing the October 2026 Exchange server security updates isn’t requir","workaround":"This issue is resolved in Windows updates released on and after November 10, 2026 such as (KB5131090) . We recommend you install the latest Windows update for your device as it contains important improvements and issue resolutions, including this one. After installing KB5070884 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. 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