Ontinue ION

Ontinue occupies a genuinely distinct niche in the MDR market. It offers the deepest available specialisation in Microsoft security tooling specifically, built for organisations running Defender for Endpoint, Microsoft Sentinel, and Entra ID as their primary security stack. Reviewers consistently note the depth of Microsoft-specific expertise as meaningfully ahead of generalist MDR providers who cover Microsoft alongside a dozen other platforms without the same specialist depth. The Microsoft partnership credibility inherited from its 2022 spinout from Open Systems adds further weight to this positioning.

The honest limitation is scope and track record. Value drops sharply for organisations without substantial Microsoft security investment, and as a relatively young independent brand, Ontinue has a shorter public track record and smaller review base than Arctic Wolf, CrowdStrike, or eSentire.

The verdict: Ontinue is right for Microsoft-first organisations wanting the deepest available specialist MDR expertise within the Defender, Sentinel, and Entra ID ecosystem. Organisations with diverse non-Microsoft stacks should evaluate Arctic Wolf or Expel instead.

Last reviewed: September 2026

Strongest: Detection fidelity

Watch out for: Analyst recognition

Best for

Microsoft-first organisations running Defender for Endpoint, Microsoft Sentinel, and Entra ID wanting the deepest possible MDR expertise within that specific ecosystem.

Not suitable for: Organisations with diverse, non-Microsoft security stacks, or those wanting a vendor with a longer independent track record.