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⚠️ Exchange DAG, dynamic quorum and an unexpected datacenter failover behavior
A missing File Share Witness, dynamic quorum vote recalculation, and a real-world datacenter isolation scenario led to unexpected Exchange DAG behavior during a failover event. In this post, we analyze how dynamic quorum adjusted node votes, why the “wrong” datacenter retained quorum, why previous DR tests did not reveal the issue, and how hidden quorum…
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📦 Exchange troubleshooting and log collection: why time matters
Exchange troubleshooting often begins too late — after important logs have already been overwritten. In this post, we discuss the Microsoft ExchangeLogCollector script, why rapid diagnostic collection matters, and how preserving the right data early can dramatically improve the chances of successful Root Cause analysis.
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🛡 Antivirus on Exchange Servers: When “Configured According to Best Practices” Still Isn’t Enough
Antivirus software is mandatory on Exchange servers, but misconfiguration goes far beyond missing folder exclusions. This article explains how antivirus process-level integration can silently affect IIS and Exchange services, why issues may look unrelated to antivirus at first glance, and how Microsoft-provided diagnostic scripts help identify configuration problems.
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📅 A Second Calendar Took Over: Why New Events Land There and How We Fixed It
A real-world Exchange support case where a second calendar suddenly became the default one. All existing meetings stayed in the old calendar, while new events were created in the new one. We walk through why Exchange can’t tell you who caused it, why third-party mobile apps are often involved, and how to restore the correct…
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