Why Every Business Needs Multi-Factor Authentication (MFA)

What MFA actually is

A password alone is one factor: something you know. MFA adds a second factor, usually something you have (your phone), so an attacker with your password still can't log in. When a user signs into Microsoft 365 or your VPN, they enter their password, then approve a prompt on their phone or enter a short code from an authenticator app.

Why MFA is so effective

Nearly every real-world attack against SMB Microsoft 365 tenants starts with a stolen or phished password. MFA breaks that chain. Even with the correct password, the attacker cannot complete the sign-in without physical possession of the user's second factor.

• Blocks credential-stuffing attacks using passwords leaked from other services
• Blocks the majority of phishing attacks that steal passwords
• Required by most modern cyber insurance policies
• Now expected by clients and enterprise vendors as a baseline

The different types of MFA (not all equal)

How to roll out MFA without chaos

• Enable MFA on administrator accounts first: that's the highest-value target
• Communicate with staff before enforcement: what will change, why, what to install
• Provide a written guide for enrolling in Microsoft Authenticator
• Enforce with Conditional Access, not per-user MFA, since it scales properly
• Configure trusted locations sparingly: usually the office public IP only
• Have a documented process for lost phones and re-enrollment

Common mistakes we see

• MFA enabled but not enforced, so users can skip it
• Legacy authentication protocols still enabled, allowing MFA bypass
• Admin accounts using the same MFA method as regular users
• Break-glass emergency accounts with no MFA at all (they should have hardware key MFA)
• Shared mailboxes converted to user accounts with MFA disabled

Frequently asked questions