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Microsoft Purview Implementation, Part 0: What to Do Before the Technical Work Starts

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By Jere Haavisto
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Microsoft Purview Implementation, Part 0: What to Do Before the Technical Work Starts

If you are planning a Microsoft Purview implementation, do not start in the portal. Most Purview projects do not fail because someone missed a setting in the portal. They fail because the organization starts the technical work before it has decided what Purview is supposed to do, who owns the decisions, and which business problems matter first. By “do not start in the portal”, I do not mean the technical side is irrelevant. I mean the technical capabilities should guide the preparation, not replace it.

That is the part worth saying out loud. A Microsoft Purview implementation is not mainly a technical task. It is a business, governance, legal, and operating model task first, and only then a technical one. Microsoft Purview crosses data security, compliance, governance, and sometimes AI readiness at the same time. If the groundwork is unclear, the technical implementation usually just makes that confusion more expensive and more time-consuming.

This post is about what I would get in place before anyone starts building labels, publishing policies, onboarding data sources, or handing out admin roles.

I see this as Part 0 of a practical Microsoft Purview implementation series. I am calling it Part 0 on purpose because it sits before sensitivity labels, DLP, retention, or any of the more visible controls. If this groundwork is weak, the rest of the implementation usually turns into a more expensive version of the same confusion.

Skip to the good part

Microsoft Purview implementation is not a technical task

This is the main point of the whole article. Microsoft Purview gets implemented through technical controls, but the hard part is usually not labels, policies, scans, or role assignments. The hard part is deciding what data should be governed, what the policy actually means, who owns the decisions, what legal basis applies, and how much friction the business is willing to accept.

If those decisions are weak, the technical team does not solve the problem. It just automates the ambiguity. That is why I think Microsoft Purview implementation should start as a governance and operating model exercise with legal, privacy, records, security, and business ownership involved from day one.

Decide what Purview is for in your environment

Purview is usually discussed like it is one platform and one project. In real life, it is several different conversations hiding behind one name. Microsoft’s own permissions guidance separates the platform across data security, data governance, risk and compliance, and AI and Copilot areas, and those areas do not always involve the same owners or the same rollout pattern. Permissions in the Microsoft Purview portal is a good reminder of that.

This is the first decision I would force the project to make:

  • Are we trying to classify and protect Microsoft 365 content?
  • Are we trying to build a governed catalog of data across sources?
  • Are we trying to improve retention, records, audit, or eDiscovery?
  • Are we trying to reduce AI-related oversharing risk?
  • Or are we trying to do all of that at once, which is usually a polite way of saying we have not prioritized anything yet?

If your first problem is oversharing in Microsoft 365, the starting point often lives around sensitivity labels, DLP, and collaboration controls. If the problem is that nobody knows what data exists across the estate, then the starting point looks more like Data Map, Unified Catalog, governance domains, and data products. Microsoft is also explicit that Data Map and Unified Catalog deal with metadata, not access to the underlying data. That matters, because people love assuming “catalog” means “access solved”. It does not. Plan for data governance with Microsoft Purview says that clearly.

Pick the first one or two scenarios

This is one of the better pieces of Microsoft guidance because it is boring and correct. For sensitivity labels, Microsoft recommends choosing the top one or two scenarios that map to the most important business requirements first instead of trying to deploy everything at once. Get started with sensitivity labels says that directly.

That same idea works well across Microsoft Purview more broadly. Before technical implementation starts, I would want a short list of scenario statements that sound like this:

  • We need HR and finance documents in Microsoft 365 to have a usable classification model.
  • We need to reduce external oversharing of highly sensitive content.
  • We need a first governance domain for finance analytics data so people can actually find trusted data products.
  • We need retention coverage for specific regulated records with legal and audit involvement.
  • We need visibility into where sensitive content exists before we start enforcing anything.

What I would not accept as a scenario is “implement Purview”. That is not a scenario. That is a budget line.

Each scenario should answer four things:

  • What business problem are we solving?
  • Which data or workloads are in scope?
  • Who owns the decision?
  • What would success look like in 90 days?

If the team cannot answer those before the build starts, the project is still in discovery even if someone has already booked workshops.

Build the working team before the project starts

Microsoft recommends a working virtual team for sensitivity label deployment, and Microsoft also says data governance planning should involve data owners, data stewards, business users, and IT early. Those two points fit together quite nicely. Microsoft Purview works best when you accept that it is not a solo admin project. Get started with sensitivity labels and Plan for data governance with Microsoft Purview both point in that direction.

The team I would want on the table before the technical phase starts would usually include:

  • Security or compliance leadership
  • Microsoft 365 platform owners
  • Data owners from the first in-scope business areas
  • Legal, records, or privacy stakeholders when retention, eDiscovery, or regulatory controls are involved
  • HR if the rollout affects employee data handling or insider risk scenarios
  • Service owners for Exchange, SharePoint, Teams, endpoints, or data platforms depending on scope
  • Communications or adoption people if end-user behavior is going to change

Just as important, I would want one accountable owner. Not a steering group with seven half-owners. One accountable owner.

Microsoft Purview decisions get messy when nobody owns the tie-breakers. That is how you end up with sixteen labels, three contradictory policy ideas, and a pilot that quietly turns into permanent confusion.

Agree the classification, retention, and governance language

If you are implementing information protection, the most important design work usually happens before you create the first label. Microsoft recommends creating labels according to your organization’s classification taxonomy, using names that make sense to users, and testing the names and tooltips with the people who actually have to apply them. It also recommends keeping the initial label set small enough to stay usable. Get started with sensitivity labels and Learn about sensitivity labels are both pretty consistent on that point.

That means you should decide:

  • What your sensitivity levels actually are
  • What each level means in human language
  • Which controls belong to each level
  • Which examples users should see when choosing a label
  • Where manual labeling is enough at first and where automation may be needed later

I would also separate three conversations that organizations often mix together:

  • Sensitivity and protection
  • Retention and records
  • Data governance and catalog curation

They connect, but they are not the same thing.

A “Confidential” label is not a retention strategy. A retention label is not a data product. A glossary term is not an encryption policy. If you let all of those decisions collapse into one workshop, the result is usually a diagram that looks impressive and a rollout that nobody trusts.

For data governance projects, the same pre-work exists in a different form. Microsoft recommends defining governance domains, owners, glossary terms, critical data elements, and data products with business experts before the technical onboarding work is treated as complete. That tells you something important: the catalog is not just a scanner with a nicer logo. It needs business meaning to be useful. Plan for data governance with Microsoft Purview and Plan for Unified Catalog with best practices make that pretty clear.

Design ownership and permissions before access is granted

This is where I see a lot of projects get lazy. Somebody wants to move faster, so they give a few people Global Administrator and promise to clean it up later. Then later never arrives.

Microsoft’s documentation is direct here: use the fewest permissions possible and keep the number of users with the Global Administrator role low. Microsoft Purview uses RBAC, and the solution-specific roles vary depending on what you are implementing. For sensitivity labels alone, Microsoft lists role groups such as Information Protection, Information Protection Admins, Information Protection Analysts, Information Protection Investigators, and Information Protection Readers. Permissions in the Microsoft Purview portal and Get started with sensitivity labels both cover this.

Before the technical implementation starts, I would want an access model that answers:

  • Who can design policy
  • Who can approve policy
  • Who can publish policy
  • Who can investigate and read data-related findings
  • Who only needs read-only visibility
  • Which tasks still require service-specific permissions outside Microsoft Purview

That last point matters more than many teams expect. Microsoft states that Microsoft Purview portal permissions do not cover every service-specific permission. Some tasks still require permissions in the relevant admin center, such as Exchange. If you miss that early, your project plan looks fine until the first person tries to do actual administration and discovers half the prerequisites live somewhere else.

If the organization is large or regionally split, it is also worth deciding early whether administrative units or scoped operating models are needed. That is much easier to design before roles are scattered everywhere.

Check licensing, billing, and workload dependencies early

Microsoft Purview licensing has a special ability to make a good workshop feel less good. That is why I would check it before technical design gets too detailed.

Microsoft states that admins need a license to manage sensitivity labels, users need licensing based on the features they use, and some non-Microsoft 365 data scenarios, such as labeling in Data Map, also require pay-as-you-go billing. That is not a detail to leave for procurement after the design is done. Get started with sensitivity labels points this out clearly.

The same goes for platform dependencies. Depending on the scope, you may need to confirm things like:

  • Which Microsoft 365 workloads are actually in scope
  • Whether the required licensing is already assigned to pilot users and admins
  • Whether SharePoint, OneDrive, Teams, Exchange, endpoints, or data platform dependencies are ready
  • Which regions are supported for governance solutions
  • Whether billing and usage monitoring are understood for the services you plan to use

I would also decide upfront what is not in scope for phase one. That sounds trivial, but it is one of the easiest ways to keep Microsoft Purview projects sane. If phase one is Microsoft 365 information protection, do not let the project accidentally become an all-data-estate governance transformation at the same time.

Prepare communications, support, and the pilot model

Microsoft’s sensitivity label guidance says to publish end-user documentation, prepare the support team, test with a small group, gather feedback, and roll out iteratively. That is exactly the sort of advice that people skip because it feels less technical, right up until the help desk starts collecting the price of that decision. Get started with sensitivity labels makes a phased approach pretty hard to argue against.

Before the implementation starts, I would want these things agreed:

  • Who writes the user guidance
  • What the support team needs to know before the pilot
  • Who the pilot users are
  • What feedback channels exist
  • What success and failure signals look like
  • What the rollback or pause criteria are

A good pilot group is not just friendly users. It should include real users from the first in-scope scenarios, at least one skeptical person who will tell you where the friction is, and the operational people who will have to support the rollout later.

If you are implementing data governance features, the same logic applies. Microsoft recommends starting with early governance domains and user groups that actually need the data and can give useful feedback, not publishing a half-built catalog to everyone and hoping enthusiasm fills the gaps. Plan for Unified Catalog with best practices is very sensible on that point.

Because I work in Finland, I think this deserves a specific note. A Microsoft Purview implementation here should usually be reviewed not only against the GDPR, but also against Finland’s Data Protection Act, which the Office of the Data Protection Ombudsman says supplements the GDPR. The same guidance also points out that Finland has specific legislation for certain processing situations, including the Act on the Protection of Privacy in Working Life.

That matters in practice when Purview features touch employee data, communications, monitoring, investigations, or broad content inspection. If you are planning auditing, Insider Risk Management, Communication Compliance, auto-labeling, or large-scale content analysis, do not treat it as a pure security configuration task. Check the lawful basis, purpose limitation, transparency requirements, retention periods, and controller-versus-processor arrangements before rollout.

The Office of the Data Protection Ombudsman guidance also emphasizes risk assessment and data protection planning, accountability, clear information to data subjects, and documented arrangements when another party processes personal data on the controller’s behalf. In practice, that means you should document the processing purpose, legal basis, risk assessment, technical and organizational safeguards, processor arrangements, and user-facing notices before you enable high-impact Purview controls.

If you work in the Finnish public sector or in a strongly regulated field, verify sector-specific rules early as well. The national data protection guidance explicitly notes that, in addition to the general framework, Finland also has specific legislation for certain sectors and authority processing.

This is not legal advice. It is a reminder that in Finland, Microsoft Purview design decisions can quickly become privacy, employment, records, and sector-regulation questions, so legal and HR should be involved before the rollout, not after it.

A practical pre-implementation checklist

If I had to compress all of this into one checklist, it would look like this:

  • Decide which Microsoft Purview solution area you are starting with
  • Define the first one or two business scenarios
  • Name the accountable owner
  • Identify the cross-functional working team
  • Agree the classification taxonomy, retention model, or governance concepts needed for phase one and document them in policy
  • Map business decisions to technical controls
  • Define the least-privilege role model
  • Confirm service-specific admin dependencies outside Microsoft Purview
  • Validate licensing and billing assumptions
  • Validate legal basis, transparency, and privacy review for any in-scope personal data processing
  • Confirm workload and region prerequisites
  • Write the first version of user and support documentation
  • Choose pilot users and feedback measures
  • Define phase gates before broader rollout

Common ways to sabotage the project early

Most Microsoft Purview pain is self-inflicted. Usually not maliciously. Just very consistently.

Treating Microsoft Purview as only a technical implementation

This is the big one.

If nobody has agreed the policies, business terms, classification meaning, ownership boundaries, or rollout goals, then the technical implementation is just a very efficient way to encode confusion.

Letting taxonomy design turn into committee theater

If twenty people workshop label names for six weeks and nobody validates the result with real users, you do not have a mature taxonomy. You have a meeting habit.

Mixing governance, protection, and retention into one muddy model

These areas connect, but forcing them into one giant design artifact usually makes all three worse.

Granting broad admin rights because it is faster

It is faster in the same way that skipping seat belts is faster.

Least privilege is not optional just because the project is in a hurry. Planning the required roles and permissions should not be an afterthought.

Starting with a tenant-wide rollout

Microsoft’s own deployment guidance prefers phased rollout and pilot users for a reason. Wide rollout is a poor substitute for planning.

Assuming Microsoft Purview fixes bad underlying permissions

Microsoft Purview can help classify, govern, monitor, and protect data. It does not magically repair every broken permission model or unmanaged data sprawl problem underneath the service.

Conclusion

Before a Microsoft Purview implementation becomes a technical project, I would spend time making the organization ready to make good decisions. That means deciding which problem Microsoft Purview is solving first, choosing the first scenarios, aligning the right owners, designing the policy model, validating permissions and licensing, checking the legal footing, and preparing the pilot and support path.

That work is less exciting than clicking through the portal, but it is usually the part that decides whether the portal work becomes useful or just expensive. If the pre-work is solid, the technical implementation gets much easier. If the pre-work is weak, Microsoft Purview tends to expose that very quickly.

The next step in this series is sensitivity labels. That is where the implementation starts becoming visible to users, and it is also where weak planning starts showing up fast.

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