If you like to keep multiple Windows installations running for software testing or go-to backup purposes, you’ll be glad to know that Windows 7, like its Vista forbearer, can be run without an activation key for up to 120 days.

It’s been less than a week since Windows 7 was released to manufacturer and already we’re seeing reports that Windows 7 RTM Ultimate has been cracked using an OEM product key from computer manufacturer Lenovo (though the crack isn’t limited to their hardware).