Most of us know Microsoft 365 — but are you concerned about the security threats targeting your hosted Exchange and M365 environment? You should be. M365 is where your mail, files, and identity converge, which makes your tenant the single most valuable target in your business.
The hardening baseline
These were the essentials we published in 2020, and they remain the non-negotiables:
- Multi-factor authentication everywhere — no exceptions for executives, no exceptions for service accounts that can take modern auth.
- Conditional access policies — block legacy authentication, challenge unfamiliar sign-ins, restrict access by device compliance and geography.
- Mailbox rules auditing — attackers who land in a mailbox plant forwarding rules to exfiltrate quietly. Audit them continuously.
- Anti-phishing and safe links — tuned policies, not defaults, with your executives on the tightest settings.
- Least-privilege admin — separate admin accounts, PIM where licensing allows, and a hard look at who actually needs Global Admin.
The 2026 layer: AI-era governance
Copilot and AI integrations changed the stakes: an over-permissioned user is no longer just a risk — they're a user whose AI assistant can find everything they shouldn't see. Tenant hygiene, sensitivity labels, and permission sprawl cleanup are now prerequisites for safe AI adoption, and they're built into every AI readiness assessment we run.
As a Microsoft CSP we manage tenants end-to-end — licensing, migration, hardening, and Copilot rollout — under TechServ with security monitoring from TechSecure. If your tenant has never had a proper security review, book one now — it's the highest-value hour your IT budget will buy this year.