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Three acronyms that get used as though they are interchangeable, sometimes by the companies using them about themselves. They describe genuinely different businesses, and knowing which one you are talking to changes what you should expect from the conversation.
In short: An MSP (managed service provider) takes ongoing responsibility for running your IT: monitoring, patching, endpoint protection, backup and a service desk, for a recurring fee. A CSP (Cloud Solution Provider) is a Microsoft partner programme for reselling and supporting Microsoft 365 and Azure licences; it describes a commercial licensing relationship, not a scope of work. An MSSP (managed security service provider) specialises in threat detection and response, usually with a 24/7 security operations centre. Most small and mid-sized businesses need an MSP, often one that is also a CSP, and comparatively few need a separate MSSP.
MSP: managed service provider
This is the broadest of the three and the one most businesses are actually shopping for when they start looking.
An MSP contracts to keep your IT estate in a working, maintained state rather than to fix it when it stops. In practice that means continuous monitoring, a patching schedule the provider owns, managed endpoint protection, backup that is verified rather than assumed, and a service desk with defined coverage hours. The commercial model is recurring, usually per user or per device per month, which is what allows preventive work to be baseline rather than a line item competing for budget.
The term carries no certification. Anyone can describe themselves as an MSP, which is why the meaningful signals are elsewhere: ISO 27001 and ISO 9001 for how the provider runs itself, Cyber Essentials for baseline security hygiene, and vendor partner status for depth in a specific stack. Systech's are listed on the certifications page, and every one of them is verifiable through a public registry rather than a logo.
CSP: Cloud Solution Provider
CSP is the one most often misunderstood, because it sounds like a category of company and is actually a programme.
Microsoft's Cloud Solution Provider programme is the channel through which partners sell Microsoft 365 and Azure subscriptions. A partner in the programme handles your licensing commercially, bills you directly rather than Microsoft billing you, can adjust licence counts, and provides first-line support for the subscriptions themselves. That is a licensing and billing relationship. It says nothing about whether the partner also manages your devices, watches your estate or answers the phone at 2am.
In practice the same company usually does both, and there is a genuine advantage to that: the provider managing your Microsoft estate can see the licensing implications of what it is doing, which is where a lot of avoidable overspend comes from. Licence tiers that no longer fit, duplicate products bought to solve a problem an existing licence already covered, and renewals timed badly are all easier to catch when one party sees both sides. That work is a service in its own right, and it is set out on the Microsoft licensing and cost management page.
What matters when you are comparing providers is not to treat "Microsoft CSP" as a statement about managed service quality. It is a statement about where your licences are bought.
"Microsoft partner status tells you a company can sell you licences and has met Microsoft's bar for doing so. It does not tell you who answers when your file server stops responding on a Sunday. Those are separate questions and worth asking separately."
MSSP: managed security service provider
An MSSP concentrates on the detection and response half of security. The characteristic capability is a security operations centre: analysts monitoring telemetry continuously, threat hunting, and a contracted response when something is found. Some run this themselves, some layer it over a vendor platform, and the difference between those two is worth establishing early.
The reason most smaller businesses do not need one separately is a matter of sequence rather than value. The controls that remove the most risk at that scale are preventive and are standard MSP work: multi-factor authentication and Conditional Access on identity, managed endpoint protection, disciplined patching, email security, and backup that has actually been restore-tested. Buying continuous monitoring before those are in place produces a stream of alerts about an estate you already knew was exposed.
Where a dedicated MSSP earns its place is where the risk profile genuinely warrants it: a regulatory obligation that specifies monitoring, a sector under sustained targeted attack, or an estate large enough that security has become a full-time discipline rather than an aspect of running IT well.
Between the two extremes sits the common middle: an MSP delivering managed EDR and XDR with response, which is more than baseline endpoint protection and less than a dedicated SOC contract. That is what most businesses in the 15 to 250 seat range end up with, and for most of them it is the proportionate answer. Systech's version of that is on the security services page.
The full comparison
| MSP | CSP | MSSP | |
|---|---|---|---|
| What it is | A service model | A Microsoft partner programme | A security specialism |
| Core deliverable | A maintained, monitored IT estate | Licence supply, billing and subscription support | Threat detection and response |
| Typical scope | Monitoring, patching, endpoints, backup, service desk | Microsoft 365 and Azure subscriptions | SOC monitoring, threat hunting, incident response |
| Commercial model | Recurring per user or per device | Margin on subscriptions | Recurring, often per endpoint or per log volume |
| Certification behind the term | None inherent; look at ISO 27001, Cyber Essentials | Formal Microsoft status, verifiable | None inherent; ask what the SOC actually is |
| Who typically needs it | Most businesses | Anyone buying Microsoft licences through a partner | Regulated, targeted or large estates |
How to tell which one you are talking to
Providers rarely describe themselves narrowly, so the labels on a website are a weak signal. Three questions sort it out quickly.
"What are you contracted to keep in a particular state?" An MSP answers with a list of functions and standards. A CSP-only relationship answers in terms of subscriptions and billing. An MSSP answers in terms of detection coverage and response times.
"Who is watching, when, and what do they do when they see something?" This separates a provider running genuine security operations from one that has deployed a security product and forwarded the alerts to your inbox. Both are legitimate offerings; they are not the same purchase.
"Where do our licences sit, and can we take them with us?" Licensing through a partner is normal and usually beneficial. Being unable to move them without disruption is not, and it is worth establishing before rather than after.
What most businesses actually end up buying
For a business somewhere between 15 and 250 seats, the arrangement that fits is usually one provider acting as MSP and Microsoft CSP together, delivering managed security as part of the service rather than as a separate SOC contract, with specialist security services added if and when the risk profile changes.
That is the shape of what Systech does. Where the security requirement genuinely exceeds what a managed service should carry, we will say so rather than stretch the label, because a provider describing itself as an MSSP on the strength of a deployed product is exactly the confusion this page exists to clear up.
If you are working out whether you need a provider at all alongside existing internal IT, MSP vs internal IT covers that. If you are choosing between providers, how to choose an IT support company has the questions worth asking, and our own starting price is published on the pricing page.
Frequently asked
What does MSP stand for?
Managed service provider. It describes a company that takes ongoing, contracted responsibility for some or all of a customer's IT estate, typically covering monitoring, patching, endpoint security, backup and a service desk, for a recurring fee rather than per incident. The defining characteristic is that the provider is responsible for keeping things in a particular state rather than only for responding when they are not, which is what separates a managed service provider from an IT company you call when something breaks. In UK business usage MSP almost always means this. The abbreviation is also used for Member of the Scottish Parliament, and in retail for minimum selling price, so context matters when searching.
What is the difference between an MSP and a CSP?
An MSP manages your IT; a CSP sells you cloud licences. Cloud Solution Provider is a specific Microsoft partner programme through which partners resell Microsoft 365 and Azure subscriptions, handle billing and provide first-line support for those subscriptions. It describes a commercial relationship for licensing, not a scope of managed work. The two are frequently the same company, because a provider managing your Microsoft estate is often also the partner your licences sit with, and that combination is generally convenient. They are not the same thing though: a business can buy licences through a CSP and manage everything itself, or use an MSP while its licences sit elsewhere entirely.
Do I need an MSSP as well as an MSP?
For most small and mid-sized businesses, no, because a competent MSP already includes the security controls that matter most at that scale: endpoint protection, patching, multi-factor authentication, Conditional Access, email security and backup. A managed security service provider is a specialist that concentrates on threat detection and response, typically running a security operations centre with 24/7 analysts, threat hunting and incident response. That becomes worth buying separately when you have a regulatory obligation that requires it, a threat profile that justifies continuous human monitoring, or an estate large enough that security is a full-time discipline rather than part of good IT management. The realistic question is not which acronym to hire but what level of detection and response your risk actually warrants.
Can one company be an MSP, a CSP and an MSSP?
Yes, and many are, though the depth behind each label varies enormously. Being a Microsoft Cloud Solution Provider is a formal partner status that can be verified. Being an MSP is a description of a service model with no certification attached to the term itself, though standards like ISO 27001, ISO 9001 and Cyber Essentials are meaningful proxies. 'MSSP' is the least regulated of the three, and is sometimes applied to a provider that has deployed a security product rather than one running a genuine detection and response capability. If security operations matter to you, ask specifically who is watching, at what hours, from where, and what they are contracted to do when they see something.
Which type of provider does a 50-person business usually need?
Almost always an MSP, frequently one that is also a Microsoft CSP so licensing and management sit together, and rarely a separate MSSP. At that size the security work that reduces the most risk is the work a good MSP does as standard: identity hardening, endpoint protection, patching discipline, tested backup and email security. Buying a dedicated security operations service before those fundamentals are in place tends to produce alerts about an estate that has not been secured, which is an expensive way to find out what you already knew. The exception is a business in that range carrying an unusual obligation or threat profile, where a specialist alongside the MSP is proportionate.
