IT & Cybersecurity · 2026-04-17 · by Cybergate Technology
A Microsoft 365 security baseline is a set of recommended security settings - multi-factor authentication, conditional access, anti-phishing, safe links and audit logging - applied to every account so your tenant is protected by default rather than left on weak defaults.
Turn on MFA for everyone
Multi-factor authentication (MFA) is the single most effective control. Enforce it for all users, including admins, using the Microsoft Authenticator app rather than SMS where possible. The vast majority of account-takeover attacks fail the moment MFA is in place.
Use Conditional Access
Conditional Access lets you require MFA, block legacy authentication and restrict risky sign-ins by location or device. Blocking legacy auth (POP/IMAP/SMTP basic) closes one of the most common attack paths into Microsoft 365.
Enable anti-phishing and Safe Links
Microsoft Defender for Office 365 adds anti-phishing policies, Safe Links and Safe Attachments. These scan links and files at click-time and catch the spoofed login pages used to steal credentials.
Switch on audit logging and alerts
Enable unified audit logging and mailbox auditing so you can investigate if something goes wrong, and set alerts for suspicious mailbox rules, mass downloads and impossible-travel sign-ins.
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