『How to Set Up Data Loss Prevention (DLP) in Microsoft 365』のカバーアート

How to Set Up Data Loss Prevention (DLP) in Microsoft 365

How to Set Up Data Loss Prevention (DLP) in Microsoft 365

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 Are you actually protecting your company’s data, or just ticking a compliance box? Most admins set up a few blanket DLP rules and assume they’re covered. But if sensitive files are still slipping through Teams chats or emails, that’s a massive blind spot. In this podcast, I’ll show you how to build a layered DLP strategy inside Microsoft 365—step by step, like assembling a real security system. By the end, you’ll know if your setup is just policy paperwork, or an actual fortress. Let’s find out which one you’ve got.The Hidden Map of Your Sensitive DataEvery company thinks they have a clear handle on where their files live. Ask three different admins and you’ll almost always hear three different answers. Some swear everything important is locked down in SharePoint. Others claim OneDrive is where the bulk of corporate files sit. Then there’s always someone who insists Teams has become the new filing system. The truth is, they’re all correct—and that mix is exactly where the challenge begins. Data in Microsoft 365 is everywhere, and once you start poking around, you realize just how scattered it really is. That scattering, or “data sprawl,” sneaks in quietly. A finance manager stores quarterly forecasts in OneDrive to finish at home. HR officers send performance reviews as attachments inside Teams chats. Sales reps drop entire customer lists into email threads so they can ask quick questions. None of this feels risky at the time—it’s just how people get their work done. But from an admin’s perspective, it’s chaos. Sensitive data ends up scattered across services that weren’t designed as the final resting place for long‑term confidential files. Here’s where the headache begins. You’ve been told to build DLP policies, but you sit down, look at the console, and realize you don’t even know which workloads hold the dangerous stuff. If you target too broadly, you risk endless false positives and frustrated users. If you target too narrowly, you blind yourself to leaks happening in less obvious places. That’s the tension—how do you lock down what you can’t even find? Picture this: one of your project managers, excited to share progress, posts a confidential report into a Teams channel with external guests. The file syncs to people’s laptops before you even wake up in the morning. No one involved meant harm. They just didn’t realize an internal-only file was suddenly accessible to outsiders. That tiny slip could turn into regulatory fines or even a reputational hit if the wrong set of eyes lands on the document. And the worst part? Without visibility tools in place, you might not even know it happened. SharePoint brings its own subtle traps. You might believe a library is safely restricted to “internal only,” but the second sync client is enabled, those files flow down to end‑user laptops. Suddenly you have copies of sensitive material sitting unencrypted in places you can’t directly monitor. A misplaced laptop or a personal backup tool picking up synced data means confidential material leaks outside your intended perimeter. None of that shows up if you’re only staring at basic access controls. This is why discovery matters. Microsoft includes tools like Content Explorer and Activity Explorer for exactly this reason. With Content Explorer, you can drill into where certain sensitive information types—like financial IDs or personal identifiers—are actually stored. It’s not guesswork; you can see raw numbers and counts, broken down across SharePoint, OneDrive, Teams, and Exchange. Activity Explorer builds on that by highlighting how those sensitive items are being used—whether they’re shared internally, uploaded, or sent to external contacts. When you first open these dashboards, it can be sobering. Files you thought were locked away neatly often show up in chat threads, temp folders, or forgotten OneDrive accounts. By building this map, you trade uncertainty for clarity. Instead of saying “we think payroll data might be in SharePoint somewhere,” you know exactly which sites and which accounts hold payroll files, and you can watch how they’re accessed day to day. That understanding transforms how you design protection strategies. Without it, your rules are guesses—sometimes lucky ones, sometimes costly misses. With it, you’re working from evidence. What discovery really does is shift invisible risks into visible assets. Once something is visible, you can measure it, plan around it, and ultimately protect it. That’s a huge change in approach for admins. You stop standing in reaction mode—responding only after a problem surfaces—and start proactively shaping your defensive posture based on actual data flows. So before we talk about setting any rules or policies, the first foundation stone is this discovery step. Think of it like surveying the land before building anything. If you don’t know what sits beneath the soil—rocks,...
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