Custom PC builds require an operating system, and Windows licensing has some nuances that are worth understanding before purchase. Buying the wrong licence type or from an unverified seller is a common mistake.
Licence Types
OEM (Original Equipment Manufacturer): Licensed to one specific hardware configuration (tied to the motherboard). If you replace the motherboard, the licence needs to be reactivated or repurchased. Typically sold as "OEM" or "System Builder" editions. Less expensive than Retail. This is what Sephora Systems includes in builds.
Retail: Can be transferred between machines. If you build a new PC and want to carry your licence over, a Retail licence allows this. More expensive than OEM.
Volume / Enterprise: For organisations with 5+ machines. Not appropriate for individual builds.
Home vs. Pro
Windows 11 Home covers consumer use cases. Windows 11 Pro adds BitLocker encryption, Remote Desktop hosting, Hyper-V virtualisation, and domain join. For most personal users and small professionals: Home is adequate. For businesses needing remote access to workstations or encryption: Pro is worth the premium.
Windows 11 Pro for Workstations adds NVMe RAID, ReFS file system, and Persistent Memory support — relevant only for specific high-end workstation use cases.
Where to Buy
Purchase Windows licences from Microsoft directly or from authorised resellers. Low-priced Windows keys sold on marketplaces are frequently tied to volume licences that may be deactivated by Microsoft. A proper OEM licence from a reputable source is more reliable than a ₦2,000 key of unknown origin.