Microsoft 365 is the engine room for most modern businesses. But out of the box, its security settings are configured for convenience, not maximum protection. Relying on defaults is like leaving your office door unlocked because the building has a security guard downtown.
Taking control of these settings is one of the fastest, most impactful ways to boost your security posture. Here are five critical changes you should make today.
1. Enforce Multi-Factor Authentication (MFA) for Everyone. No Exceptions
This is the single most important action you can take. A password alone is no longer secure. MFA adds a second verification step, like a code from an app on your phone, blocking 99.9% of account compromise attacks, according to Microsoft.
- How to Do It: In the Microsoft 365 admin center, navigate to Users > Active users. Click on Multi-factor authentication. Select all users and Enable enforcement. Use the Conditional Access policies for more granular control but start by turning it on for all.
- Why It Matters: It stops attackers dead in their tracks, even if they have an employee’s password.
2. Disable Legacy Authentication Protocols.
Legacy protocols like POP3, IMAP, and SMTP are old email standards that do not support modern security like MFA. They are a favorite backdoor for attackers.
- How to Do It: You will need to use Conditional Access policies in Azure AD (part of your Microsoft 365 subscription). Create a policy that blocks legacy authentication for all users and cloud apps. Microsoft provides a clear step-by-step guide to achieve this.
- Why It Matters: It plugs a major security hole that bypasses your strongest defenses.
3. Review and Restrict Admin Privileges.
Too many users have global administrator rights. This is dangerous. The principle of Least Privilege means users should only have the access needed for their job.
- How to Do It: Go to the Microsoft 365 admin center > Users > Active users. Filter by Roles. Review every Global Administrator. Can their role be changed to a more limited one, like User Administrator or Helpdesk Administrator? Microsoft offers a variety of admin roles.
- Why It Matters: It limits the damage if an account is compromised and reduces the risk of insider error.
4. Enable Self-Service Password Reset (SSPR).
This is a security and productivity win. It reduces the load on your IT team (or you, the business owner playing that role) and allows users to securely reset their own passwords after verifying their identity through multiple methods.
- How to Do It: In the Azure AD portal, go to Password reset > Properties. Set it to All. Then configure the Authentication methods (recommend at least two, like mobile app notification and mobile phone).
- Why It Matters: It empowers users and ensures password issues are resolved quickly without creating insecure workarounds.
5. Configure and Monitor Audit Logging.
If you don’t know what’s happening in your environment, you can’t spot trouble. Audit logging records user and admin activities. It is essential for investigating suspicious events and is often required for compliance.
- How to Do It: In the Microsoft 365 compliance center, go to Solutions > Audit. Ensure it is turned On. You can search the audit log for specific activities, like file downloads or failed logins.
- Why It Matters: It provides the digital paper trail you need for security investigations and compliance audits.
Taking the Next Step
Managing these settings is an ongoing task. At Bespoke Technology Group, we include Microsoft 365 security configuration and monitoring as a core part of our managed IT services. We ensure these foundations are not just set, but actively maintained and reviewed.
Want a professional review of your Microsoft 365 security settings? Contact us for a quick, focused audit. [Contact Us Here]