Resource center
Deactivate and transfer a Microsoft license
Retail keys move freely between machines as long as you deactivate the old PC first. OEM keys can't be transferred.
Windows — remove the key
Open elevated PowerShell on the old PC and run: slmgr /upk (uninstall product key) then slmgr /cpky (clear from registry). Reactivation will prompt for a key on the new PC.
Office — sign out and uninstall
In any Office app: File → Account → Sign out. Then Control Panel → Programs → uninstall Office. Online, visit account.microsoft.com/services to detach the install slot.
Before you click any download
If a URL above does not start with microsoft.com, learn.microsoft.com or aka.ms, stop and report it to research@licensevault.net. Counterfeit ISOs are the single largest source of activation tickets we see — always check the SHA-256 hash Microsoft publishes alongside its download.
More resources
Official Microsoft ISO downloads
Every link below points to a Microsoft-hosted ISO or Media Creation Tool. We don't host installers — only the keys.
Product key format reference
Every Microsoft product key is 25 characters in 5 groups. Here's how to tell what you've got.
Activation troubleshooting reference
The 12 errors that account for 90% of support tickets — and the one-line fix for each.