Microsoft 365 Security Setup for Canadian SMBs: 12-Point Checklist (2026)
Start with identity
Turn on MFA for every account, enable security defaults or Conditional Access, and block legacy authentication. Identity is where nearly every M365 breach begins, so it's where hardening pays off most.
Then email and data
Enable anti-phishing and safe-links/safe-attachments, turn on audit logging, and review external sharing in SharePoint and OneDrive. These catch the attacks that get past the login.
Then monitoring and recovery
Check your Microsoft Secure Score, set up alerts for risky sign-ins, and confirm you have a backup of M365 data — Microsoft replicates but does not back up your mailboxes for you. IT Cares can apply and monitor the full baseline.
Action checklist
- ✅ Enforce MFA on every user
- ✅ Block legacy authentication protocols
- ✅ Enable anti-phishing and safe-links policies
- ✅ Turn on unified audit logging
- ✅ Review external sharing in SharePoint/OneDrive
- ✅ Check and raise your Microsoft Secure Score
- ✅ Set alerts for risky or impossible-travel sign-ins
- ✅ Back up M365 data with a third-party tool
FAQ
Is Microsoft 365 secure by default?
It is reasonably secure but not hardened. Critical protections like MFA enforcement, blocking legacy auth, and anti-phishing policies often need to be switched on. A short hardening checklist closes the common gaps.
Does Microsoft back up my Microsoft 365 data?
No. Microsoft replicates data for availability but does not provide point-in-time backup of your mailboxes and files. Use a third-party M365 backup so you can recover from deletion or ransomware.
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