Microsoft has issued guidance to uninstall KB5074109 security update or switch to webmail after the patch caused Outlook ...

Beware this highly sophisticated Microsoft 365 attack. Update, March 15, 2025: This story, originally published March 13, has been updated with further technical detail regarding the Microsoft 365 ...

Microsoft and Cloudflare teamed up to take down a notorious phishing service known as "RaccoonO365," the companies said this week. In a blog post, Microsoft said its Digital Crimes Unit used a court ...

KnowBe4 today announced a strategic integration with Microsoft to strengthen email security. As the first initiative in Microsoft's ICES (Integrated Cloud Email Security) vendor ecosystem, this ...

Update, August 10, 2025: This story, originally published on August 7, has been updated with additional information following a demonstration of the shared service principal exploit at the Black Hat ...

Microsoft says its Defender for Office 365 cloud-based email security suite will now automatically detect and block email bombing attacks. Defender for Office 365 (formerly known as Office 365 ...

An ongoing phishing campaign abuses a little‑known feature in Microsoft 365 called "Direct Send" to evade detection by email security and steal credentials. Direct Send is a Microsoft 365 feature that ...