MICROSOFT LICENSING · MODULE 4 · WINDOWS CLIENT
Windows client licensing:
per device or per user?
Windows on a PC and Windows Server follow different licensing rules. This guide explains when the device matters, when the user matters, and which Windows rights Microsoft 365 E3, E5, and F3 already include.
The short answer
The device needs the baseline. The user can hold additional Enterprise rights.
A business PC first needs a valid Windows base licence, usually Windows Pro. Windows Enterprise E3 or E5 is typically assigned to a user and extends those existing rights. Microsoft 365 E3, E5, and F3 may already include those Enterprise entitlements.
- 01Windows Pro is normally the qualifying baseline on the device.
- 02Windows Enterprise can be licensed per device or per user.
- 03Microsoft 365 E3, E5, and F3 include different Windows Enterprise rights.
- 04Windows Server and core licensing are covered separately in Module 5.
Explained simply · The essential terms
Three essential Windows licensing terms
Windows licensing requires distinguishing the device's base licence from the user's additional rights.
Windows Pro
The typical business Windows baseline on a PC or laptop.
Windows Enterprise
Additional Windows rights often assigned to a user through Microsoft 365 E3, E5, or F3.
Qualifying operating system
An already licensed starting edition needed for an Enterprise upgrade—normally Windows Pro.
A practical example: A business laptop is purchased with Windows Pro. An employee receives Microsoft 365 E3 and therefore additional Windows Enterprise rights. The E3 licence does not replace the laptop's Windows Pro baseline.
Start by separating the products
Windows client is not Windows Server
Both products are called Windows. Their purpose and licensing rules are nevertheless different.
For PCs, laptops, and cloud desktops
Windows 11 Pro and Windows 11 Enterprise are workplace operating systems. The key licensing concepts are devices, users, and virtual desktops.
For servers and infrastructure
Windows Server Standard and Datacenter support applications, files, and virtualised servers. Cores, virtual machines, and access licences become relevant there.
The current mainstream Windows Server editions are Standard and Datacenter. There is no current Windows Server edition called Enterprise.
The two licensing models
Per device or per user: what is the difference?
The essential question is whether the usage right belongs to a specific computer or a specific person.
The operating-system licence belongs to the computer
A new business PC is often purchased with Windows Pro already installed. That base licence is associated with the device. Multiple people can use the PC one after another, subject to the applicable terms.
Enterprise rights belong to the person
Windows Enterprise E3 or E5 is assigned to an individual user. That person can use the Enterprise rights on eligible devices. For Windows Enterprise E3 in CSP, Microsoft describes up to five devices per licensed user.
A Windows Pro device baseline and a user's Enterprise entitlement may both be needed. Shared devices also require the appropriate separate licences for Microsoft 365, Office, and other applications.
Windows rights already included
What is included in Microsoft 365 E3, E5, and F3?
Before buying another Windows licence, always check which Microsoft 365 subscription is already assigned to the user.
| Existing plan | Windows entitlement | Important |
|---|---|---|
| Microsoft 365 E3 | Windows Enterprise E3 included | A qualifying Windows Pro baseline on the device remains necessary. |
| Microsoft 365 E5 | Windows Enterprise E5 included | Adds security rights beyond E3, including Defender for Endpoint Plan 2. |
| Microsoft 365 F3 | Windows Enterprise E3 included | For frontline users; excludes Windows Enterprise LTSC, Windows Autopatch, and MDOP. |
| Microsoft 365 F1 | Windows Enterprise E3 not included | Do not assume F1 and F3 provide the same Windows rights. |
| Office 365 E3 or E5 | No automatically included Windows Enterprise | Office 365 and Microsoft 365 are different products. |
Microsoft confirms that F3 includes the Enterprise operating-system features, but explicitly excludes Windows Enterprise LTSC, Windows Autopatch, and Microsoft Desktop Optimization Pack. F3 is therefore not identical to regular Windows Enterprise E3 in every respect.
The most important prerequisite
Why Windows Pro still matters when you have Microsoft 365
Windows Enterprise is generally an upgrade entitlement. An upgrade first requires a suitable, already licensed operating system.
Windows Pro PC + Microsoft 365 E3
The device has an appropriate baseline. The licensed user can use the included Enterprise rights in accordance with the applicable Product Terms.
Windows Home PC + Microsoft 365 E3
Windows Home is not the appropriate Pro baseline for the ordinary commercial Enterprise upgrade. First license the device correctly for Windows Pro.
Unlicensed PC + Microsoft 365 E5
Even an expensive E5 subscription does not automatically replace a missing base Windows licence on the device.
The qualifying starting edition depends on product, agreement, purchase date, and usage scenario. Education exceptions and specialised virtualisation rights must be checked separately.
Windows in the cloud
Virtual desktops: what about Azure Virtual Desktop and Windows 365?
A virtual Windows workplace is still a Windows client. Running in the cloud does not automatically turn it into Windows Server.
Eligible user licence + Azure costs
Microsoft lists Microsoft 365 E3, E5, F3, and Business Premium, as well as Windows Enterprise E3 and E5, among eligible licences. Virtual machines, storage, and networking are billed separately through Azure.
Cloud PC subscription + prerequisites
Microsoft requires Windows E3, Intune, Entra ID P1, and a Windows 365 licence. Some prerequisites may already be included in an appropriate Microsoft 365 bundle.
Access without a conventional Windows Pro device
Windows Virtual Desktop Access can be relevant for particular remote-access or thin-client scenarios. Whether rights are assigned per user or per device depends on the exact offer.
An Azure Virtual Desktop access entitlement is not the same as a complete regular Windows Enterprise E3 package. Always check the specific product and intended use separately.
Quick orientation
Which licence fits which situation?
These examples provide initial guidance. Binding usage rights always depend on the current Microsoft Product Terms.
| Situation | Typical approach | Also check |
|---|---|---|
| A normal business PC | Windows Pro for the device | Is the Windows Pro licence valid and documented? |
| A user needs Enterprise features | Windows Enterprise E3/E5 or an appropriate Microsoft 365 bundle | Does the device have a qualifying Pro baseline? |
| A frontline user works on Windows devices | Microsoft 365 F3 with included Windows Enterprise E3 | Are LTSC, Autopatch, or other excluded additional rights needed? |
| A workplace runs in Azure | An eligible AVD licence or Windows 365 | Additional Azure, Cloud PC, and product prerequisites |
| A server or multiple server VMs are operated | Windows Server Standard or Datacenter | Core licensing, virtualisation rights, and potentially CALs in Module 5 |
Before purchasing
Six questions are enough for an initial check
- 01Is this a Windows workplace or actually Windows Server?
- 02Which Windows edition is installed: Home, Pro, or Enterprise?
- 03Is the device's required base licence valid and documented?
- 04Does the user already have Microsoft 365 E3, E5, F3, or a standalone Windows Enterprise licence?
- 05Does an F3 user need additional rights such as LTSC or Autopatch?
- 06Is Windows used locally, through Azure Virtual Desktop, or as a Windows 365 Cloud PC?
Key takeaway
Check the device baseline first. Then check the user's rights.
Microsoft 365 E3, E5, and F3 may already include Windows Enterprise. That avoids duplicate purchasing, but it does not automatically replace the required Windows Pro baseline or turn a Windows client into Windows Server.
Official sources
Checked against current Microsoft documentation.
The information reflects publicly documented guidance on 22 August 2026. Product rights, prerequisites, and offers may change.
- 01Microsoft Licensing: Windows 11 Enterprise licensing↗Open source
- 02Microsoft Learn: Windows commercial licensing overview↗Open source
- 03Microsoft Learn: Windows Enterprise E3 in CSP↗Open source
- 04Microsoft: Windows 11 Enterprise plans and Microsoft 365 F3↗Open source
- 05Microsoft Learn: Azure Virtual Desktop licensing↗Open source
- 06Microsoft Learn: Windows 365 Enterprise licensing requirements↗Open source
- 07Microsoft Learn: Comparison of Windows Server editions↗Open source
Note: This article provides clear practical guidance and does not replace checking current Microsoft Product Terms, the specific agreement, orderable SKU, purchase date, and actual usage scenario.