MDR and a managed SOC are two different services, and the difference matters more than the acronyms suggest.
Both give you protection you don’t have to staff yourself. Both run around the clock. But they cover different ground, involve people to different degrees, and suit organisations at different stages. Choosing the wrong one means either paying for depth you don’t need, or discovering a gap at the worst possible moment.
Here’s the honest comparison, including where each one stops.
What is MDR?
Managed Detection and Response is a service built around detecting suspicious activity early and acting on it. Ours uses Microsoft Defender as its cornerstone, so it concentrates on the areas attackers hit most often: endpoints, user identities and Microsoft 365.
The defining characteristic is that it’s automation-led with expert management. Detection and response run continuously without needing your input, and our specialists manage the service, tune it and handle what it surfaces. For a business with a lean IT team, that’s the appeal: strong protection over the highest-risk ground, with almost no operational overhead on your side.
What is a managed SOC?
The Atlas Cloud Security Operations Centre is a broader service with a different centre of gravity: continuous human analysis. UK-based analysts monitor your environment 24/7, backed by Microsoft Sentinel correlating signals from across your whole estate rather than endpoints alone.
That wider remit brings things MDR doesn’t include: proactive threat hunting, dark web monitoring, guaranteed response SLAs, MITRE ATT&CK-tagged incidents, and a live portal where you can watch investigations as they happen. It’s the difference between being protected and being able to demonstrate you’re protected.
MDR vs SOC: side by side
Choose a managed SOC if
You’re in legal, financial services or another regulated sector where evidence matters as much as protection.
Your estate spans servers, cloud platforms and line-of-business applications.
Clients, insurers or auditors ask what your monitoring actually covers.
If the honest answer is “somewhere in between”, that’s usually a sign to talk it through rather than guess. The right answer depends on what’s actually in your estate, not on which acronym sounds more thorough.
Starting with one and moving to the other
Plenty of organisations begin with MDR and move to SOC coverage as they grow, take on regulated clients, or add systems beyond Microsoft 365. Because both our services are built on the Microsoft security stack, that step extends what you already have rather than replacing it. No re-platforming, no new provider, no gap in cover during the change.
It’s worth understanding the economics before you decide. Running an equivalent capability internally costs upwards of £400,000 a year, which we break down in our guide to what a SOC really costs.
What to ask any provider
Whichever service you’re considering, and whoever you’re considering it from, these five questions separate substance from marketing: What exactly is covered, endpoints only or the full estate? Are people watching out of hours, or only automation? What are the guaranteed response times, in writing? Where is the team based and where does our data live? And can we see what you’re doing without waiting for a monthly report?
Frequently asked questions
What is the difference between MDR and a SOC?
MDR focuses on endpoints, identities and Microsoft 365, led by automation with expert oversight. A managed SOC adds continuous analyst monitoring across your whole estate, guaranteed response SLAs, proactive threat hunting and live reporting. MDR protects the most commonly attacked areas; a SOC covers everything and proves it.
Is MDR enough on its own?
For many smaller organisations, yes. If your estate is largely Microsoft 365 and endpoints, and you have limited regulatory reporting obligations, MDR covers the ground attackers target most often. Businesses with servers, wider cloud platforms or audit requirements typically need SOC coverage.
Can we start with MDR and move to a SOC later?
Yes. Both services are built on the Microsoft security stack, so stepping up extends what you already have rather than replacing it. No re-platforming and no change of provider.
What about EDR and XDR?
EDR (endpoint) and XDR (extended) are detection technologies. MDR is a managed service that operates them on your behalf. Buying the technology without the service leaves the alerts for your own team to handle.
How much do MDR and SOC services cost?
Both are priced per user or device per month and scoped to your environment. Our SOC starts from £15 per user per month. Running the equivalent in-house costs £400,000+ a year.
Not sure which fits your business?
Book a 30-minute call with our UK team. We’ll look at what’s actually in your estate, your compliance obligations and your existing Microsoft licensing, then tell you which service fits, and if that’s the lighter option, we’ll say so.
Book a discovery call Explore the SOC serviceFind out more about our 24/7 UK Security Operations Centre.
