User CAL vs. Device CAL – which is right for your business?
Anyone running a Windows Server in their business will, sooner or later, face the question: User CAL or Device CAL? At first glance, the decision may seem like a minor procurement detail – but in reality, it determines whether you end up overpaying by several hundred euros a year for your access licences, or whether you discover a gap in your licence inventory during an audit. The short answer is: if your staff each use multiple devices, User CALs are the more cost-effective choice. If, on the other hand, several people share the same devices – for example, in shift work, at till terminals or on workshop computers – you’ll find Device CALs more cost-effective. In practice, the answer is rarely so clear-cut, as most organisations face both situations simultaneously.
In this guide, we explain how Microsoft access licences work, where the typical cost pitfalls lie, and how you can use a simple decision tree to find the right model for your business in just a few minutes.
Key points at a glance
- A CAL (Client Access Licence) is not software, but an access right. It is required in addition to the server licence.
- A User CAL licences a named individual – who may access the software from any number of devices.
- A Device CAL licences a specific device – any number of people may work on it.
- Rule of thumb: more devices than people in the company? User CALs. More people than devices? Device CALs.
- User CALs and Device CALs can be freely combined within the same environment.
- CALs are backwards compatible but not forwards compatible: a 2025 CAL can access older servers, but a 2022 CAL cannot access a Windows Server 2025.
- For Remote Desktop Services, you require a separate RDS CAL in addition to the Windows Server CAL.
What is a User CAL?
A User CAL is assigned to a named individual. This person may then access the server services from any number of end devices – from their office computer, from a laptop whilst working from home, from a work mobile phone and from a tablet in a meeting room – without incurring the cost of additional licences for each device.
How per-user licensing works
The allocation is organisational, not technical: you maintain a list of which CAL is assigned to which person. What matters is the number of people, not the number of devices or concurrent connections. A company with 40 employees who collectively use 95 end devices requires 40 User CALs under the user model – regardless of how many devices are connected to the network.
Typical use cases for User CALs
- Knowledge work and administration, where each person uses a desktop, laptop and smartphone simultaneously
- Companies with home-office or hybrid models, where staff work from varying locations
- Environments where personal devices are permitted for business access
How per-user licensing works
With a User CAL, the access licence is assigned to a specific user. The key factor is therefore the number of authorised users – not the number of devices that these users employ.
Real-world example:
A company employs 40 staff members who, between them, use 95 end devices. In the User CAL model, it is generally the case that 40 users are the relevant reference point – regardless of how many devices these individuals use.
Official Microsoft information on CAL licensing
Would you like to check the licensing principles directly with the manufacturer? Lizenzdeals24 provides you with the relevant official Microsoft information for you to review directly.
What is a User CAL?
A User CAL is assigned to a named individual. This person may then access the server services from any number of devices – from their office computer, from a laptop whilst working from home, from a work mobile phone and from a tablet in a meeting room – without additional licences being required for each device.
How per-user licensing works
The allocation is organisational, not technical: you maintain a list of which CAL is assigned to which person. What matters is the number of people, not the number of devices or concurrent connections. A company with 40 employees who collectively use 95 end devices requires 40 User CALs under the user model – regardless of how many devices are connected to the network.
Typical use cases for User CALs
- Knowledge work and administration, where each person uses a desktop, laptop and smartphone simultaneously
- Companies with home-office or hybrid models, where staff work from varying locations
- Environments where personal devices are permitted for work-related access
User CAL vs. Device CAL: a direct comparison
The following overview summarises the practical differences:
| Criterion | User CAL | Device CAL |
|---|---|---|
| Licensed to | a named individual | a specific end device |
| Access is permitted for | that person from any number of devices | any number of people using this device |
| Requirements depend on | the number of staff | Number of devices accessing the system |
| Cost-effective for | more devices than people | more people than devices |
| Working from home and BYOD | very well suited | usually uneconomical |
| Shift work | usually uneconomical | Very well suited |
| Administration | Assignment to user accounts, ideally with Active Directory | Inventory of end devices required |
| Staff turnover | Re-assignment possible at any time upon departure | Not an issue, as it is device-dependent |
| Device replacement | Not an issue, as it depends on the individual | Reassignment to the replacement device required |
Conclusion: How to make the right decision
The choice between a User CAL and a Device CAL is, at its core, a simple calculation, weighted by how your organisation is structured. Count your staff and devices, assess the direction in which your business is heading, and do not shy away from a hybrid solution if your administrative and production departments operate differently.
For most office-based and service-sector companies, User CALs are now the obvious choice, as several end devices per person have long been in use. Where, on the other hand, workstations are occupied on a rotating basis, Device CALs remain the clear advantage. In both cases, it is not so much the type of licence that is decisive, but rather the clear documentation behind it.
Are you unsure which model is more cost-effective for your environment? Let us know the number of your staff and end devices – we’ll assess your requirements and put together the right combination of server licences and access licences for you.
FAQ: Frequently asked questions about User CALs and Device CALs
A Microsoft Server CAL authorises a user or a device to access a correspondingly licensed Microsoft Server.
It is crucial to choose the right option between User CAL and Device CAL – depending on your organisation’s IT infrastructure.
The right choice depends on who is accessing the server.
If employees use multiple devices, a User CAL is often the right solution. If devices are shared by several people, a Device CAL may be more appropriate.
The required number depends on the selected licence model.
For User CALs, the number of authorised users counts; for Device CALs, the number of authorised devices counts. This allows licensing to be tailored specifically to the company’s structure.
No. A User CAL is assigned to a person, not to a single computer.
An authorised user can use it to access the server from various devices in accordance with the Microsoft licence terms .
The server version is crucial when selecting the appropriate Microsoft CAL.
You should therefore check before purchasing which Microsoft Windows Server version is used in your organisation. This will help you avoid incorrect licence allocation.
Yes. Lizenzdeals24 is listed as an official partner in the Microsoft Partner Network.
Companies can check our Microsoft partner and reseller details directly with Microsoft . Further certificates and seals from Lizenzdeals24 can also be found online.
Yes. Businesses can conveniently purchase on invoice at Lizenzdeals24.
This provides business customers with transparent processing with a proper invoice and allows them to purchase their software licences professionally through their business operations.
Clear documentation provides peace of mind. Companies should be able to track at any time which licences have been purchased and to whom or which devices they have been assigned.
Lizenzdeals24 supports companies with transparent licence provision and traceable purchase documentation – an important foundation for internal licence management and preparation for potential licence audits.
Your decision. Our support.
Would you like to implement your Microsoft Server licensing securely and in a way that suits your business? Lizenzdeals24 supports you in making your selection, prepares a bespoke quote on request and is available to answer your questions personally.
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