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Microsoft 365 Security Checklist

Key Microsoft 365 security and administration areas for business environments.

Identity

  • Enable MFA for users, especially administrators.
  • Minimize standing privileged roles.
  • Review stale or unnecessary accounts.
  • Use strong account recovery practices.

Administrative access

  • Use dedicated admin accounts where practical.
  • Limit Global Administrator assignments.
  • Review who can change security settings.
  • Protect administrative devices and sessions.

Email security

  • Review anti-phishing and impersonation protections.
  • Use SPF, DKIM, and DMARC appropriately.
  • Train users to verify sensitive requests through a second channel.
  • Monitor suspicious mailbox rules or forwarding.

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The Oncitetek Technology & Cybersecurity Assessment can turn these questions into prioritized findings and recommendations.

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