Microsoft says an Exchange Online issue that mistakenly quarantined legitimate emails last week was triggered by faulty heuristic detection rules designed to block credential phishing campaigns.

Microsoft has confirmed that a faulty anti-phishing detection rule designed to stop credential theft campaigns mistakenly ...

Microsoft 365 Copilot bug let AI summarize confidential emails despite DLP rules. What it means for your data and safety.

Microsoft confirms Exchange Online and Teams messages were mistakenly quarantined due to a phishing detection bug (EX1227432).

Since 5 February, Microsoft Exchange Online has been silently swallowing legitimate business emails. Most people affected still don't know it. The problem, tracked as service incident EX1227432, began ...