Microsoft 365 is often the identity, email, collaboration and file-sharing centre of a small business. That makes configuration and account security business-critical. Microsoft’s current security guidance for Microsoft 365 for business prioritises MFA, protected administrator accounts and appropriate security policies.
1. Require multi-factor authentication
MFA reduces reliance on passwords alone. Microsoft provides MFA capabilities across Microsoft 365 for business, and ASD also includes MFA in the Essential Eight. Review not only whether MFA is enabled, but whether exceptions, legacy access or shared accounts weaken the intended protection.
2. Separate and protect administrator accounts
Daily email and web browsing should not unnecessarily use highly privileged accounts. Keep administration controlled, review who has elevated roles and maintain a recovery process for privileged access.
3. Review leavers, guests and dormant accounts
Old accounts and unnecessary access increase exposure. Have a repeatable process for staff departures, contractors, guests, shared mailboxes and ownership of cloud files.
4. Strengthen business email protection
Business email compromise can lead to fraudulent payment requests, invoice interception and account misuse. Combine technical protections with staff procedures for verifying unusual financial or bank-detail changes.
5. Understand Microsoft 365 backup and retention
Retention, recycle bins, version history and third-party backup are different concepts. Decide what the business expects to recover after deletion, ransomware, account compromise or extended discovery requirements, and make sure the chosen controls match that expectation.
6. Manage devices that access business data
For businesses using Microsoft 365 Business Premium or other management capabilities, device compliance and endpoint protection can strengthen access controls. The appropriate design depends on licensing, device ownership and operating requirements.
7. Review the tenant regularly
A practical next step
Turn the checklist into a business-specific action plan.
FabSys can review your current environment, identify the highest-impact gaps and explain the next actions in plain English. You can use FabSys for a focused assessment or project even if another provider already supports your IT.
Official guidance & further reading
These external resources provide authoritative background for the controls discussed above.
Common questions
Is enabling MFA enough to secure Microsoft 365?
MFA is an important control, but businesses should also review admin accounts, suspicious access, email protections, user lifecycle, devices and recovery requirements.
Can FabSys review Microsoft 365 without replacing our IT provider?
Yes. FabSys can provide an independent Microsoft 365 security and resilience review and document priority improvements.
Does Microsoft 365 include every type of backup a business may need?
Microsoft 365 includes retention and recovery capabilities, but businesses should define their own recovery expectations and determine whether additional backup is appropriate for their risks and requirements.