This page outlines the different Windows and Windows Server license types and how to identify which one is installed on your system.
| License Type | Description |
|---|---|
| OEM (Original Equipment Manufacturer) | Preinstalled by PC manufacturers; tied to hardware; non-transferable |
| Retail | Purchased separately; can be transferred to another PC |
| Volume (MAK/KMS) | Used by businesses; activated via Key Management Server or Multiple Activation Key |
| Evaluation | Trial version; usually 90–180 days (especially for Windows Server) |
| Insider Preview | Pre-release builds from Microsoft Insider Program (time-limited) |
| License Type | Description |
|---|---|
| Retail | Boxed license, requires activation key |
| Volume (KMS/MAK) | For organizations; activated using centralized KMS or single-use MAK |
| OEM | Preinstalled by server vendors; non-transferable |
| Evaluation | Time-limited version (typically 180 days) |
| Azure Edition | Licensed for Azure-hosted VMs; not for on-premise use |
🧠 CALs (Client Access Licenses) are also needed for each user/device accessing a Windows Server.
slmgr /dli