Microsoft 365 Security
Microsoft 365 is a powerful platform, but it still needs the right security, backup and monitoring. This section covers practical Microsoft 365 security guidance for businesses, including account protection, data recovery, phishing risks, secure configuration and ongoing monitoring.
These articles are written for business owners, managers and IT decision-makers who want to understand how to protect Microsoft 365 without getting lost in unnecessary technical detail.
Latest Microsoft 365 Security Articles
Read practical guidance on Microsoft 365 security, backup, monitoring, phishing protection, account compromise and secure configuration for business users.
Microsoft Teams Is Getting AI-Powered Phishing Detection – Here’s What Users Will See
Microsoft Teams is adding AI-powered, context-aware phishing detection to warn users about suspicious external chats and social-engineering attempts. Here’s what users will see and what businesses should know.
Microsoft Says AI Agents Are the New Insider Risk – What Businesses Need to Know
Microsoft says AI agents should be treated as insider risks, with their own identities, least-privilege permissions and continuous monitoring. Here’s what this means for businesses.
Critical PHP Security Update: What Business Website Owners Should Check Now
Updated 23 October 2026: PHP has confirmed CVE-2026-109618 and CVE-2026-109619 can allow unauthenticated remote code execution. Fixed releases are now available and businesses should update immediately.
Why Has Exchange Server Email Stopped Working After the October Windows Update?
Microsoft has confirmed that October 2026 Windows Server updates can make on-premises Exchange Server unstable, affecting OWA access and mail flow. Here’s what businesses should check.
ConnectWise Cloud Backup Breach: What Microsoft 365 Businesses Should Check Now
ConnectWise has suspended Cloud Backup after unauthorised access to application identities was used against Microsoft 365 tenants. Here’s what businesses and IT teams should check now.
Microsoft October 2026 Security Update Fixes Actively Exploited Windows Zero-Day
Microsoft’s October 2026 security update fixes an actively exploited Windows Shell zero-day and two other publicly disclosed zero-days. Here’s what businesses should do now.
Outlook Attachments Blocked by Conditional Access
Microsoft is applying existing Conditional Access policies directly to Outlook attachment actions. Here is why files may be blocked and what businesses should check.
Microsoft September Update Fixes Two Exploited Zero-Days
Microsoft’s September 2026 security update fixes two vulnerabilities already being exploited. Here is what UK businesses should check and do now.
Microsoft Warns of Passkey Phishing Targeting Microsoft 365 Users
Microsoft is tracking attacks that use fake passkey and MFA support calls to compromise Microsoft 365 accounts, add attacker-controlled authentication methods and steal cloud data.
Need help securing Microsoft 365?
Microsoft 365 security should cover more than passwords and basic MFA. KES can help review your users, licences, backup, monitoring, account protection and security settings to identify gaps before they become business problems.