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How to Investigate Suspicious Microsoft 365 Sign-Ins Before They Become Account Takeovers

How to Investigate Suspicious Microsoft 365 Sign-Ins Before They Become Account Takeovers

by Ron Samson | Sep 11, 2026 | Microsoft Security

Why suspicious Microsoft 365 sign-ins deserve a disciplined investigation Microsoft 365 identity events are often the earliest observable signal of a business email compromise, ransomware intrusion, or data theft campaign. The challenge is that a suspicious sign-in is...

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