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Vaikora vs Microsoft Defender for Office 365

The built-in default, and a second independent engine that runs in your own subscription.

Microsoft Defender for Office 365 is the native option, included with several Microsoft 365 plans and operated entirely by Microsoft. Vaikora for Microsoft 365 is not a replacement for it. It is a second, independent detection stack that runs on a VM in your own Azure subscription and reports into Sentinel, for teams who want defence in depth from a different vendor's engine or need analysis to stay inside a boundary they control.

At a glance

Capability	Vaikora for Microsoft 365	Microsoft Defender for Office 365
Relationship to Microsoft 365	Additive second layer	Native, built into the platform
Where messages are analysed	A VM in your own Azure subscription	Microsoft's cloud
Detection lineage	Data443 engine plus ClamAV, independent of Microsoft	Microsoft threat intelligence
Licensing	Azure Marketplace, separate from your M365 plan	Included with qualifying M365 plans or added per seat
Integration	Microsoft Graph change notifications	Native to the mail platform
SOC integration	Azure Monitor and Sentinel workbook plus analytic rules	Defender portal, and Sentinel via connector
Why add it	Vendor diversity and a tenant-local processing boundary	Baseline protection already in the platform

How they compare

This is not an either/or

Almost nobody turns Defender off. It is native, it is already licensed in most tenants, and it is deeply integrated with the rest of Microsoft 365. The honest framing is that Vaikora runs alongside it, and the question is whether a second, independent engine is worth adding rather than which one wins.

Why a second engine at all

Detection stacks share blind spots with themselves. An engine from a different vendor, trained on different data, catches a different tail. That is the standard argument for defence in depth and it is the main reason to layer anything on top of Defender. Whether it justifies the cost depends on your threat model, not on a feature table.

Where the processing boundary sits

Defender analyses in Microsoft's cloud, which for most organisations is unremarkable because the mail already lives there. For organisations with sovereignty rules, contractual restrictions or an audit posture that treats the tenant boundary as the line, Vaikora's model of analysing on a VM in your own subscription is the distinguishing property.

How it shows up for the SOC

Defender surfaces in the Defender portal and can be connected to Sentinel. Vaikora provisions Sentinel resources directly as part of its deployment, including a workbook and analytic rules, so its findings are Sentinel-native from the first day rather than routed through an additional connector.

Who each is best for

Choose Vaikora when

You want a second detection engine from a different vendor.
Analysis needs to happen inside a boundary you control and audit.
Your SOC is standardised on Sentinel and wants findings there natively.
Procurement through Azure Marketplace is preferred.

Choose Microsoft Defender for Office 365 when

You need baseline email protection and it is already in your licence.
Adding another vendor is not justified by your threat model.
You have no residency or sovereignty constraint.
You would rather not operate any additional infrastructure.

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Frequently asked questions

Does Vaikora replace Microsoft Defender for Office 365?

No. Defender is native to Microsoft 365 and most organisations keep it running. Vaikora is a second, independent layer alongside it, for teams that want vendor diversity in their detection or need analysis to happen inside their own tenant.

Why would we pay for both?

The usual reason is defence in depth. Two engines from different vendors, trained on different data, fail differently, so the second one catches part of the tail the first misses. Whether that is worth it depends on your threat model, and it is a fair question to ask rather than assume.

Where does Vaikora process our mail?

On a VM created by the Azure Marketplace template in your own Azure subscription. Defender processes in Microsoft's cloud. For most organisations that distinction does not matter; for some it is the whole decision.

Do detections show up in Sentinel?

Yes. The deployment provisions Azure Monitor and Sentinel resources including a workbook and analytic rules, so findings land in the workspace your SOC already uses.