Security SKUs: Buying What You Need

What are security SKUs and why do they drive the bill up?

Security SKUs are the licensing lines that sell Microsoft identity, endpoint, email, and data protection, and they drive the bill up because each one is priced as essential and packaged to pull you toward the top edition. In a Microsoft 365 estate the security spend lives in three places: inside the E5 edition, inside the Microsoft 365 E5 Security add on that sits on top of E3, and inside standalone SKUs such as Entra ID P1 and P2, Microsoft Defender plans, Purview for compliance, and Intune for device management. The reason the total climbs so fast is that security is the easiest thing for any vendor to upsell, because no buyer wants to be the one who declined a control and then had an incident. That fear is real, and it is also the lever. The discipline is to separate the controls you will deploy and operate from the ones that simply make the quote look complete.

This is a specific case of the broader buyer principle that you price what you will use, not what you are offered. For the foundations of that approach across every vendor, the SaaS Negotiation Guide sets out how to build a deal from the parts you need rather than accept a bundle whole.

Should you jump to E5 or buy security SKUs separately?

You should jump to E5 only when you will deploy security, compliance, voice, and analytics broadly enough that the bundle genuinely beats the sum of the standalone SKUs you actually need. The E3 to E5 step is attractive because it folds advanced security, advanced compliance, Teams Phone, and Power BI into one number, but most organisations adopt one or two of those pillars deeply and barely touch the rest. When the real requirement is stronger identity protection and endpoint defense for a defined population, the targeted route is usually cheaper: add Entra ID P2 where you need conditional access and identity governance, add the Microsoft 365 E5 Security add on where you need the full Defender and Entra security stack on an E3 base, and leave the analytics and voice pillars out until a separate business case justifies them. The honest comparison is the standalone cost of the security capability you will operate against the full E5 uplift across every seat, and that comparison almost always favours buying the parts when adoption is narrow.

The same logic that governs the broader edition decision applies here. For how the E3 and E5 tiers compare beyond security, read E3 versus E5: negotiating the right level, and for what the upsell to the top tier is genuinely worth, see the E5 upsell and what it is worth.

Which Microsoft security SKUs are worth buying on their own?

The security SKUs worth buying on their own are the ones that close a control gap your current tools leave open and that you have the team to operate. Identity is almost always the highest value line, because conditional access, multi factor enforcement, and identity governance reduce the most common breach paths, which makes Entra ID P1 or P2 a defensible standalone buy. Endpoint and email defense through Defender plans matter where you lack equivalent coverage, and data governance through Purview matters where a compliance obligation forces it. The SKUs to question are the ones that duplicate a tool you already run well, or that require an operating capability you do not have, because an unoperated security control is shelfware that still carries risk.

How do you avoid paying twice for the same security capability?

You avoid paying twice by mapping every Microsoft security SKU against the controls you already own before you sign for any of it. Most enterprises arrive at a Microsoft renewal already running a third party endpoint detection tool, an identity provider, an email security gateway, or a data loss prevention product, and the E5 or E5 Security pitch quietly assumes you will pay Microsoft for the same job a second time. The audit is simple to describe and powerful in the room: list each control, name the tool that delivers it today, name the Microsoft SKU that would overlap, and decide deliberately whether to consolidate onto Microsoft and retire the other cost, or to decline the Microsoft line. Consolidation can be a genuine saving when it lets you cancel a meaningful third party contract, but only if you count that cancellation in the math. Buying the Microsoft control while keeping the incumbent is the worst outcome, because you carry two costs for one capability and operate neither cleanly.

How do you negotiate security SKUs at renewal?

You negotiate security SKUs by treating the security line as separable from the rest of the agreement and by bringing adoption data to every claim. Ask for standalone pricing on each security SKU so the E5 bundle has to beat the parts. Bring usage evidence that shows how many seats truly need P2 over P1, how many endpoints Defender would actually cover, and where an existing tool already does the job. Request that any security uplift be capped at a low single digit indexed rate and locked at the SKU level, so a future repackaging cannot reprice the control mid term. Where Microsoft pushes the full E5 leap, counter with a security only configuration that meets the requirement, and let the vendor justify the additional pillars on their own business case. The fear sell is strongest on security, so the buyer who comes with a deployment plan rather than a blank cheque holds the leverage.

A worked example of right sizing the security stack

Consider an indicative example. A mid sized financial services firm on Microsoft 365 E3 is offered a full move to E5 across all eight thousand seats, sold primarily on the security improvement. Rather than accept the leap, the buyer separates the requirement: it needs strong identity protection for every user, advanced endpoint defense for a four thousand seat population, and compliance tooling for one regulated business unit. It prices Entra ID P2 across the base, the Microsoft 365 E5 Security add on for the four thousand seats that need it, and Purview for the regulated unit, then compares that to the all seat E5 uplift. The targeted configuration covers the genuine risk for materially less than the full E5 move, and it retires an overlapping third party endpoint tool in the process. These figures are indicative, but the pattern is reliable: by buying the security SKUs the estate will operate and declining the rest, the buyer lands inside the 10 to 30 percent savings that disciplined negotiation typically produces, by published market estimates.

What to do next

Before you accept any E5 leap framed as a security upgrade, separate the security requirement, price each SKU on its own, and map it against the tools you already run. The Microsoft specific tactics live on the Microsoft 365 and Copilot negotiation service, the full clause set sits in the Microsoft 365 and Copilot kit, and the underlying method runs through the SaaS Negotiation Guide.

Last reviewed December 2025