Exchange Server

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1. 19 Oct
   October Windows Server update breaks Exchange sign‑in and mail flow

   Microsoft says October 2026 Windows Server security updates can cause Outlook on the web sign‑in failures and mail delivery problems on some on‑premises Exchange servers. The issue is linked to a new default limit on Endpoint Mapper memory that can restrict simultaneous Endpoint Lookup calls under heavy load.

   Security · 1 source

   

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