Managed XDR explained
Managed XDR for organisations without the analysts to run it
Extended detection and response (XDR) pulls signals from your devices, identities, email and cloud services into one platform and links related events into a single incident. Buying the platform is the easy part. This guide explains what XDR does, what it takes to run well, and where a managed service fits.
For IT and security leads · Reviewed September 2026
What XDR is
XDR is a security platform that collects activity from several sources, including endpoints, user identities, email, cloud services and the network, and analyses them together. Where separate tools would raise separate alerts, XDR recognises that they belong to one attack and presents them as a single incident.
How it differs from EDR
EDR watches the devices where its agent is installed. XDR includes that data and adds identity, email, cloud and network activity, so it can follow an attack that moves between them.
What MXDR means
MXDR stands for managed extended detection and response. Microsoft uses the term for services built on Defender XDR and Sentinel. It means the same as managed XDR: a provider runs the platform and responds to what it finds.
What it does not replace
XDR is built for detection and response. It does not always keep the business-system logs that investigations and compliance reporting need, which is why many organisations also run a SIEM.
How XDR translates signals into incidents
The value of XDR is correlation. A suspicious sign-in on its own may be nothing. The same sign-in minutes after someone opened a phishing email, followed by a new mailbox forwarding rule, is an account takeover in progress.
Collect
Connectors bring in activity from endpoint agents, identity providers, email, cloud platforms and network devices.
Correlate
Detection rules and analytics link related events across those sources and score them as one incident.
Respond
An analyst investigates the incident and takes action, such as isolating a device, disabling an account or removing a rule.
What running XDR takes
Most XDR platforms are sold on what they can do once connected and tuned. Getting there, and staying there, is ongoing work for people with the right skills.
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01
Connecting data sources
Each identity provider, cloud tenant, mailbox service and network device has to be connected, tested and kept connected as systems change.
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02
Tuning
Out-of-the-box rules produce noise. They need adjusting to your users, systems and normal behaviour so real incidents stand out.
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03
Detection engineering
New attack techniques need new rules. Someone has to write, test and maintain them as threats change.
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04
Response authority
Agreed rules on who may isolate a device or disable an account, and when, so action is not delayed by a 3am phone call.
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05
Platform upkeep
Licences, connectors, retention settings and product updates all need managing, along with the cost of the data you ingest.
Moving from a SIEM? Our guide to SIEM-to-XDR migration covers when the move makes sense and how to run the two in parallel. Read the guide →
XDR, SIEM and a managed SOC
These are often discussed as alternatives. In practice they overlap, and many organisations use more than one.
| XDR platform | SIEM | Managed SOC | |
|---|---|---|---|
| What it collects | Security signals from endpoints, identity, email, cloud and network | Logs from almost any system, including business applications | Whatever your platforms collect, plus threat intelligence |
| How it finds threats | Built-in correlation and analytics | Rules and queries written by your team or provider | Analysts using the platform, hunting and investigating |
| Who does the work | Your team, unless it is managed | Your team, unless it is managed | The provider, around the clock |
| Best suited to | Organisations wanting joined-up detection across common sources | Organisations with wide logging, investigation or compliance needs | Organisations without the in-house analysts to run either |
Your platform, run by our analysts
We run the major XDR platforms, including Microsoft Defender XDR, LevelBlue, SentinelOne, CrowdStrike and Elastic. If you already own one, we operate it for you. Managed XDR can be delivered on its own, but most organisations are better served by one of our managed SOC tiers, where the same analysts add threat hunting, threat intelligence and reporting your board can use.
Platforms we runQuestions about managed XDR
What is MXDR?
MXDR stands for managed extended detection and response. Microsoft uses the term for services built on Defender XDR and Sentinel, but it means the same as managed XDR: a provider runs your XDR platform, investigates what it finds and responds on your behalf.
Does XDR replace a SIEM?
Not always. XDR correlates security signals for detection and response. A SIEM also keeps logs from business systems for investigation and compliance reporting. Many organisations run both, or choose a platform that combines them. Our guide to SIEM-to-XDR migration covers when replacing a SIEM makes sense.
Which XDR platforms do you work with?
We work with Microsoft Defender XDR, LevelBlue, SentinelOne, CrowdStrike and Elastic. If you use another platform, talk to us and we will tell you whether we can support it.
Can Talanos manage our XDR on its own?
Yes, although most clients choose one of our managed SOC tiers, which adds threat hunting, threat intelligence and risk reporting to the same monitoring and response.
How does managed XDR fit with NIST CSF?
It mainly supports the Detect and Respond functions: continuous monitoring, analysis of adverse events, incident management and mitigation. It also provides evidence for Govern, such as incident metrics for board reporting.
What does managed XDR cost?
It depends on how much data you send to the platform, how many sources are connected and how much of the response the provider handles. Data volume is usually the largest and least predictable part. Our guide to SOC outsourcing costs explains how providers price these services.
Talk to us about your XDR platform
Whether you already own an XDR platform or are choosing one, a 30-minute call will show what it would take to run it well. No preparation needed.
Book a discovery call