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Windows Server 2025 Zugriffslizenzen CAL

GBP39.00
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Original Microsoft license
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// Description

Product Info

Have you already installed your Windows Server 2025? Then you now need the right client access licenses (CALs). Microsoft licenses on the "server + access" principle. This means: every person or device that accesses the server (e.g. for file storage, printing or sign-in) requires its own Client Access License (CAL).Choose flexibly between User CALs (for employees with multiple devices) and Device CALs (for fixed workstations in shift operations). Ensure legal compliance in your company and avoid under-licensing. At Keywi24 you get your CALs fast, affordably and audit-proof.

// Scope of delivery

  • License key

    XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

    25-character original Microsoft key

  • Software download

    Microsoft-signed original setup file

  • Installation & activation guide

    Step-by-step through both processes, in German

  • VAT invoice

    Proper proof of purchase as a PDF

Instantly by email after payment is received. Please also check your spam or junk folder if needed.

// Why Keywi24

5+ years of industry experience

Software licenses are our craft. Thousands of satisfied customers.

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Exhaustion principle per ECJ ruling C-128/11. Every key documented.

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100% original licenses

From verified European license stock. Genuine Microsoft keys with VAT invoice.

Dr. Siegfried Zachhuber, attorney-at-law, Keywi24
Dr. Siegfried ZachhuberAttorney-at-law (Austria), Keywi24

// Legal certainty

Legally on the safe side, personally checked.

The resale of used original licenses is confirmed by the highest courts (CJEU C-128/11, Art. 12(2) URG). Every license at Keywi24 comes from verified European license stock.
More on legal certainty

// It's that easy
In 3 minutes to your licensed software

01:00

Buy

Order at a great price – you receive everything by email

02:00

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License key and download link arrive instantly by email.

03:00

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Install. Enter the license key. Done.

// Premium support for every customer

90 days of installation help included

Keywi Support Garantie
  • •Included with every purchase
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  • •If something doesn't work,
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We help you free of charge for 90 days with installing and setting up your software.

Available weekdays 8:00–18:00 via and * (optional). Remote help only with your consent. Cancel anytime.

Activation guarantee included
// Product description

Buy Windows Server 2025 CALs – User or Device?

Why do I need CALs? Buying a Windows Server license (Standard or Datacenter) alone is not legally sufficient to let employees work. The server license only covers the installation. For access to services such as file shares, print servers or Active Directory, every client needs a license.

The golden rule: New servers need new CALs. An old 2022 CAL does not entitle you to access a 2025 server. Conversely, a 2025 CAL does allow you to access older servers (backward compatibility).

Which option is right for me?

1. User CAL (per-user license)

  • The principle: A user is licensed. They may use any number of devices to access the server.
  • Ideal for: Office workers, field staff and home-office users. If an employee uses a PC, laptop, tablet and smartphone, you only need 1 User CAL.
  • Advantage: The simplest administration in modern companies.

2. Device CAL (per-device license)

  • The principle: A device is licensed. Any number of users may work on it.
  • Ideal for: Shift operations (manufacturing, hospitals, reception desks) or public PCs. If three shift workers share one PC, you only need 1 Device CAL (instead of 3 User CALs).
  • Advantage: Cost-efficient for workstations with high turnover or shared use.

Important note on Remote Desktop (RDS): These are the "standard" access licenses. If your employees are to work on the server via remote access (terminal server), you need, in addition to these CALs, the special RDS CALs.

System requirements / compatibility

  • Server version: Compatible with Windows Server 2025 (Standard & Datacenter).
  • Backward compatible: Also entitles you to access Server 2022, 2019 and 2016.
  • License type: "Paper license" (right of use). No software is installed on the client. The licenses simply need to be kept on file for an audit (User CAL) or registered on the server.
// Spec

System requirements

  • License
    User-CAL ist gerätungebunden (1 Benutzer, beliebige Geräte); Device-CAL ist benutzerungebunden (1 Gerät, beliebige Benutzer).
    Minimum
    User-CAL oder Device-CAL
  • Operating system
    Down-Edition-Rechte: Server 2025 CALs gelten auch für ältere Server-Versionen.
    Minimum
    Windows Server 2025 (Standard / Datacenter)
  • Internet
    Minimum
    Über Volume Activation Services (KMS) oder MAK-Schlüssel
// Delivery

Ready right away thanks to ESD

After your purchase you don't have to wait for the postman. Thanks to Electronic Software Delivery you receive your license key, download link and installation guide within seconds by e-mail — and install immediately.

  • Seconds instead of days
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  • Offline use & data-protection compliant