Protect sensitive information
Microsoft Purview DLP implementation
Last reviewed
Ghani Governance implements Microsoft Purview Data Loss Prevention for UK organisations. The work is knowing which information matters, which movements are actually risky, and what a legitimate process looks like, then testing policies before they block anyone. Switching on a default policy is not an implementation. We do new rollouts and estates that are already noisy.
Data loss prevention (DLP) detects sensitive information and stops or warns when it is shared where it should not go. Microsoft Purview DLP applies policies across Exchange, SharePoint, OneDrive, Teams, endpoints, browsers and Copilot, so one rule set covers email, files, devices and AI prompts.
DLP that starts from risk, not from a template
Microsoft Purview DLP can detect and control sensitive information across supported Microsoft 365 services and devices. Switching on a default policy is not an implementation. The work is knowing which information matters, which movements are actually risky, and what a legitimate finance, legal or clinical process looks like before you enforce.
Ghani Governance delivers that work for UK organisations — new rollouts and estates that are already noisy. Product behaviour is defined in Microsoft’s DLP documentation; our job is the design, test and handover layer those pages do not provide. Data-handling, acceptable-use and information-security policies are the usual written inputs, mapped in a Policy-to-Purview design report before DLP is built.
Delivered by the practice — principal scoping, then associate specialists or a referral where that is the better fit. How we staff work.
What a DLP implementation includes
Policies are introduced in stages. We do not apply organisation-wide block on day one.
Readiness assessment
Licensing, current compliance controls, existing policy set, and whether audit data is even flowing.
Sensitive data scenarios
Personal data leaving the tenant, financial files on unmanaged endpoints, confidential packs shared externally — each policy maps to a scenario a stakeholder can recognise.
Policy design
Conditions, sensitive information types, thresholds, locations, actions, exceptions and user notifications.
Endpoint DLP
Where the risk is on the device, we extend controls to supported endpoint activity rather than pretending Exchange rules cover USB and print.
Testing and simulation
Matches, false positives and exception requests are reviewed before stronger enforcement.
Noisy-estate review
If Purview is already on, we start by reading the last 30–90 days of incidents. Often the fix is fewer, clearer policies — not more.
Operational handover
Policy intent, alert workflow and change control, written so your administrators can explain it in six months.
Related national pages: sensitivity labels, Insider Risk, Unified Catalog and Data Map, Policy to Purview design, Communication Compliance, DSPM for AI. All Purview services. Greater Manchester is a service area, not a list of branch offices.
Indicative DLP implementation ranges
| Service | Planning range | Typical mid-point |
|---|---|---|
| DLP readiness assessment | £1,500–£3,500 | £2,500 |
| Focused DLP pilot | £3,500–£7,000 | £5,250 |
| Organisation-wide DLP implementation | £8,000–£20,000 | £14,000 |
| DLP policy review and tuning | £2,500–£6,000 | £4,250 |
Indicative planning ranges only. Actual cost depends on scope, user population, workloads, endpoint requirements, existing policy complexity, licensing and the number of data scenarios. These figures are not a quote and not an offer.
Implementation process
Discover the sensitive data
Information types, business processes and movement patterns.
Define DLP scenarios
Compliance and business concerns become use cases a policy can express.
Build the policies
Matching logic, scope, actions, notifications, exceptions.
Run a controlled pilot
Limited scope or audit mode so behaviour can be assessed safely.
Tune the results
Incidents, false positives, legitimate exceptions, user feedback.
Roll out and govern
Approved controls expand with documentation and owners.
DLP questions
Is Microsoft Purview a DLP solution?
Microsoft Purview includes Data Loss Prevention as one capability among others (information protection, insider risk, catalog, compliance). It can enforce DLP across supported Microsoft 365 locations and endpoints. Whether it is the right DLP for you depends on the channels you must cover. Microsoft’s own overview is the product definition we use.
Will DLP block normal business activity?
It can, if you enable block mode on untested conditions. We normally start in audit or with a limited population, read the matches, and only then raise enforcement.
Can you improve an existing DLP setup?
Yes. A noisy estate is a common starting point: overlapping sensitive information types, no owners, and users who click through every tip. The first job is to see what the policies actually match.
What does DLP stand for in Purview?
Data Loss Prevention. In Purview it is the policy engine that detects sensitive information and can warn, audit or restrict how that information is shared or moved.
Related Purview services
Other Ghani Governance Microsoft Purview services on this hub that often sit alongside DLP implementation:
- Microsoft Purview DLP policy examples for UK data — UK templates, NINO and NHS number detection, and policy tips versus block
- Policy to Purview design — map data-handling and AUP obligations before DLP is built
- Sensitivity labels and information protection — classification that DLP rules should recognise
- Insider Risk Management — investigation paths when DLP alerts point to people risk
- Communication Compliance — review of communications that leave the organisation
- DSPM for AI — sensitive-data risk when Copilot or agents touch the same content
- All Microsoft Purview services — full hub list
What is DLP? Data loss prevention explained
What is DLP? A set of policies and tools that identify sensitive data and control how it moves. A data leak (or data leakage) is unintended exposure; data exfiltration is deliberate removal. DLP solutions aim to stop both. Data leak prevention works best when it is built on labels and real business rules rather than a vendor template.
Purview DLP compared with other DLP software
Buyers comparing data loss prevention software or DLP software usually weigh three things: coverage, false positives and running cost. Microsoft Purview DLP for Exchange, SharePoint and OneDrive is included in Microsoft 365 E3, with Teams chat and endpoint DLP in E5 or the E5 compliance add-ons, so it is often the first DLP software to evaluate before buying a separate product. A cloud access security broker (CASB) – in Microsoft’s stack, Defender for Cloud Apps – extends control to non-Microsoft SaaS. Microsoft Defender for Cloud covers cloud workload posture. Together they form a broader set of data security solutions; we implement the Purview part and integrate with the rest. For DLP applied to AI tools, see Microsoft 365 Copilot data security and AI data security threats.
Book a discovery workshop
A scoping conversation about what you need to protect, what is already configured, and what must not break.