OEM and COEM New PCs are typically licenced through the Microsoft OEM or COEM programme. These software licences are pre-installed with the PC and are not sold to end customers loose.
FPP and ESD Windows 10 can be bought as a standalone product from a retailer or e-tailer.
CSP and Volume Licensing Properly licensed Microsoft operating systems (such as Windows 10, Windows 8.1, Windows 8, Windows 7, or Windows Vista) have either a full operating system license or the combination of an upgrade operating system license and a pre-existing, full operating system license. If you aren’t sure whether your Windows operating system is genuine, see What to look for.
Only certain editions of the Windows operating system qualify for upgrades under Volume Licensing agreements. For more details, download the Windows 10 Qualifying Operating Systems Chart.
If your operating system license qualifies, you can purchase the Windows 10 Pro Upgrade license or Windows 10 Enterprise Upgrade license under your Volume Licensing agreement. Note that Windows licenses that are available through Volume Licensing are upgrade-only licenses and can only be acquired on top of a base operating system license; these licenses are not a replacement for a pre-existing full operating system license.
The following conditions must be met for a licensed PC to be eligible for a Volume Licensing upgrade license:
A licensed, qualifying Windows operating system must already be installed on the device that will be assigned the Volume Licensing upgrade license.
You must remove the existing qualifying operating system from the device to deploy the Volume Licensing upgrade license, unless the PC is covered by Microsoft Software Assurance.
If you want to install or run more than one licensed operating system at one time (including the qualifying operating system), you can either: - Acquire software assurance for your volume licensing upgrade licence
- Purchase full Windows licences separately
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