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DLP With Microsoft Purview
DLP With Microsoft Purview
Learn how an MSP used Inputiv services to roll out Microsoft Purview Data Loss Prevention across 200 users — protecting data in Microsoft 365, on endpoints and over the network from a single policy set.
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Business Problem
The MSP's client had no visibility into how sensitive data — client PII, financial records and contract documents — was leaving the organisation. Staff were copying files to USB drives, pasting client data into personal webmail and uploading documents to unsanctioned cloud storage. The client already held Microsoft 365 E5 licenses but none of the included Purview DLP capability was configured, and the MSP lacked in-house expertise to design policies without triggering a flood of false positives that would block legitimate work.
Our Solution
We designed and deployed a layered Microsoft Purview DLP rollout covering cloud (Exchange, SharePoint, OneDrive, Teams), endpoint and network channels. Every policy was first run in simulation mode against live traffic, tuned against real user behaviour, and only then moved to enforcement — so 200 users were fully protected without a single business-blocking false positive at go-live.
Project Plan
1
Discovery & Data Classification
Ran Content Explorer and Activity Explorer to baseline where sensitive data actually lived and how it moved. Identified the Sensitive Information Types in scope — PII, financial account numbers, and custom SITs built for the client's internal document formats.
2
Validated E5 license assignment across all 200 users, enabled unified audit logging, and assigned Purview role groups with least privilege. Confirmed device onboarding prerequisites and Defender for Endpoint status before any policy was written.
3
Policy Design in Simulation Mode
Authored DLP policies mapped to sensitivity labels and custom SITs, then ran every policy in simulation mode for 5 days. Reviewed match reports daily and refined confidence levels and instance counts to eliminate false positives before enforcement.
4
Endpoint DLP Rollout
Onboarded all managed Windows and macOS devices to Purview via Intune. Configured restricted app groups, removable media and print controls, clipboard restrictions and unallowed browsers. Piloted on 20 users across three departments before full rollout.
5
Network DLP, Enforcement & Go-Live
Enabled network-layer controls to cover unsanctioned upload paths and browser-based exfiltration. Switched all policies from simulation to enforce, routed alerts into the MSP's ticketing queue, and handed over a policy runbook plus admin training session.
Outcomes
200
Users
Protected across cloud, endpoint and network
3
Layers
Cloud, endpoint and network DLP under one policy set
12
Days
Full project delivery end-to-end
"We had the E5 licenses sitting there unused for two years. Inputiv turned them into a working DLP program in under two weeks — and our client's users never complained once."
— MSP Partner, US
Tech Stack
🛡️Microsoft Purview
⚙️Microsoft 365 E5
💻Endpoint DLP
📱 Intune
🏷️Sensitivity Labels
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Project Details
Client type
MSP (via partner)
End client
Financial Company, IL
Users affected
~200 users, 3 Layers
Project type
Data Loss Prevention
Delivery model
Fixed-cost project
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