Short answer
Not on its own. Microsoft 365 includes strong identity, security and data-governance features, but they protect you only once they are configured for your risks, and some depend on your licence level. FirstNet's Microsoft 365 security and compliance service adds that configuration, plus monitoring and independent layers where they are needed.
In detail
Misconfigurations and weak identity controls are the root cause of many breaches, and regulations add pressure for data governance, retention and auditability. A tenant needs guardrails that balance productivity with protection, which is the focus of FirstNet's hardening work across identity, devices, applications and data.
Beyond tuning Microsoft's own controls, FirstNet can add independent layers:
- Mimecast in front of Microsoft 365, with separate threat intelligence, sandboxing and URL rewriting, and optional email continuity if Microsoft 365 itself is down
- Sophos MDR, which can ingest Microsoft Defender telemetry, so you keep Defender and add analyst-led detection around the clock
- Druva backup for Exchange, OneDrive, SharePoint and Teams, because retention is not backup when files are deleted or ransomware encrypts synced data
A Microsoft 365 security assessment, made up of a tenant review, gap analysis and prioritised action plan, shows where your tenant stands and which fixes to tackle first.
Source: FirstNet Microsoft 365 Security & Compliance service page →
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