When you buy a copy of Windows from a store, you get a Retail key. You enter it, your PC talks to Microsoft, and your PC is activated.
The activation is valid for . Every 7 days, the computers automatically contact the server to renew this timer. slmgr skms kms8 msguides com
If you have used this command and wish to return your computer to its default state (perhaps to activate with a legitimate retail key later), you need to clear the server setting. When you buy a copy of Windows from
If the server is online and the "count" on that server is high enough, your Windows will activate. your PC talks to Microsoft