I get asked this in two forms. Sometimes it is a genuine architecture question. More often it is a procurement question wearing a disguise: we are paying for the higher tier, does that mean we are compliant.
The short answer is that Microsoft Purview gives you capability, not compliance. It is a strong set of controls and I use it constantly. It does not, and cannot, make you compliant on its own.
What Purview genuinely gives you
Used properly, Purview covers a real portion of what a regulator expects you to be able to demonstrate.
It can find and classify personal data across Microsoft 365 and beyond, which answers the question of where the data actually is rather than where you believe it is. It can apply sensitivity labels that travel with a document. It can enforce data loss prevention across endpoints, services and cloud applications. It can hold and dispose of records on a defined schedule rather than by accident. It can surface insider risk. It can support discovery when something goes wrong.
Those are not small things. Most organizations I see are using a fraction of what they already own.
What it does not cover, and cannot
Everything on this list is a GDPR obligation that no product configuration satisfies:
- A lawful basis for each processing activity, decided and recorded
- A record of processing activities that reflects what the organization actually does
- Data protection impact assessments for the processing that requires one
- Contracts and due diligence for processors and sub-processors
- A working process for subject access, rectification and erasure requests, within the time limits
- The decision, under pressure, about whether a given incident is notifiable and to whom
- Transfer mechanisms for data leaving the jurisdiction
Purview can support several of these. It can make a subject access request faster to fulfil. It can give you evidence for a record of processing. It cannot decide your lawful basis, and it cannot write your contracts.
The gap that actually causes failures
The failures I see are rarely a missing control. They are a control that was deployed without a decision behind it.
A retention policy applied because it was a default, not because anybody agreed how long that data should live. Labels published with names the business does not understand, so everything gets marked with whichever one sounds safest. DLP in audit mode indefinitely because nobody wanted to own the first false positive.
In each case the product is working exactly as configured. What is missing is the decision the configuration was supposed to express. That is also what an auditor asks about, because it is the difference between a control and a setting.
How to use Purview well
Start from the obligations rather than the feature list. Take the processing activities that carry real risk, decide what should happen to that data, and then configure Purview to enforce the decision. The configuration becomes evidence because it maps to something a person agreed.
Then keep the two connected. When the business changes what it does with data, the policy has to change with it. Governance that lives only in a document does not govern anything, and governance that lives only in a tenant setting cannot explain itself.
The honest answer
Purview is necessary for most organizations serious about GDPR in a Microsoft estate, and it is a genuinely good set of tools. It is not sufficient, and any account of it that says otherwise is selling licences.
If you want a single test, ask whether you could explain each Purview policy to a regulator in terms of an obligation and a decision, without referring to the product at all. If you can, the tooling is doing its job. If you cannot, you have settings rather than compliance, and the higher tier did not buy you what you thought.