Microsoft Intune Explained for Businesses

If you asked your practice manager or operations lead right now how many devices have access to client files, could they answer? Not roughly — precisely. Company laptops, personal phones, the tablet someone uses to check email at the gym. Most firms can't, and it's rarely because anyone's been careless. It's because device management has never been set up properly in the first place.

That's the gap Microsoft Intune is built to close, and it's one of the most under-used tools sitting inside licensing that most growing firms already pay for.

What Intune actually does

Intune is Microsoft's device management platform, built into Microsoft 365. In plain terms, it lets a firm control what happens on any device that connects to company data — whether that device is owned by the business or by the person using it.

For company-owned laptops and phones, Intune can enforce full management: mandatory encryption, automatic security updates, required passcodes, and the ability to wipe the entire device remotely if it's lost or stolen.

For personal devices, the phone someone uses to check email, the laptop a new starter brings in before their company one arrives, Intune can apply lighter, app-level protection instead. Client files and company email sit inside a managed, encrypted space on the device. Personal photos, apps, and messages sit outside it, completely untouched. If that person leaves the firm, the company data can be wiped from their personal phone without affecting anything else on it.

Why device sprawl is a bigger risk than firms realise

Most professional services firms end up in a mixed-device situation without ever deciding to. A partner uses their own iPad for reading documents on the train. A fee earner's replacement laptop takes three weeks to arrive, so they work from home on their own machine in the meantime. Nobody signs off on this, it just accumulates.

The risk isn't that people are being reckless. It's that nobody has visibility into what's actually connecting to the firm's data, and no consistent way to act on it. When we look at a tenant, this is one of the first things that shows up: devices with full access and no enrolment, no compliance policy, and no record of ever being reviewed.

What happens when a device isn't managed

The consequences usually show up at the worst possible moment, not day-to-day, but at the edges. A laptop is lost on a train and nobody knows what was stored on it locally. A staff member leaves and their personal phone still has the firm's email and files synced, because there was never a way to reach into that device and remove them. A new joiner's personal machine, riddled with out-of-date software, becomes the entry point for a phishing attempt that a managed device would have blocked outright.

None of these are exotic scenarios. They're the ordinary consequence of devices being allowed to connect without any policy governing what they can do once they're in.

What a proper Intune deployment actually looks like

Deploying Intune well isn't about locking every device down to the point staff can't work. It's about applying the right level of control to the right type of device.

Company-owned devices typically get the full treatment, encryption, patch management, compliance checks, remote wipe. Personal devices get app-level protection that separates work data from personal use, without the firm ever touching someone's own photos or messages. Conditional Access can then be layered on top, so that only devices meeting the firm's compliance policy, encrypted, up to date, enrolled, are allowed to reach sensitive systems in the first place.

Done properly, most staff never notice it's there. It runs in the background. The difference only becomes visible the day something goes wrong, a device is lost, someone leaves, a phishing attempt targets an old, unpatched laptop, and the firm still has control over what happens next.

Where to start

If your firm has never formally enrolled devices into a management platform, you're not unusual, it's the norm, not the exception, for firms your size. But it's worth finding out exactly what's connecting to your data before it becomes the reason for a much harder conversation.

If you're not sure what devices currently have access to your firm's systems, that's a good place to start. Happy to talk through what a proper endpoint management setup would look like for how your firm actually works.