Microsoft’s activation servers for Vista are still operational as of 2026, but support is limited. Phone activation remains available.
| Key Type | Format (Example) | Purpose | Activation Method | |----------|----------------|---------|-------------------| | | 5x5 alphanumeric | Consumer purchase | Online or phone | | OEM SLP | Embedded in BIOS | Pre-installed on branded PCs | Automatic (BIOS + certificate) | | Volume License (MAK/KMS) | 5x5 alphanumeric | Enterprise deployment | KMS (local server) or MAK (online) |
If you have an old machine and need to reinstall the OS, finding the key can be a challenge.
Understanding Windows Vista Product Keys: Activation, Recovery, and Legacy Use Windows Vista product keys are unique 25-character codes used to activate and license the operating system. These keys determine which edition (Starter, Home Basic, Home Premium, Business, or Ultimate) is installed and verify whether the license is a full version or an upgrade. ZDNET Finding and Identifying Your Product Key Depending on how you acquired Windows Vista, your product key can typically be found in one of three places: COA Sticker