Windows Anytime Upgrade (WAU) is a process of performing an upgrade of a currently installed operating system to a newer system -- Windows 7. Upgrading to Windows 7 let users enjoy the new features and application improvements in Windows, including added security features when browsing and installing software.
The requirement in using Windows Anytime Upgrade is simple: the installation of Windows 7 must be run on top of the existing version of Windows Vista or a lower version of Windows 7.
To use Windows Anytime Upgrade, click on the Start button or type Windows Anytime Upgrade in the search box, and then clicking Windows Anytime Upgrade in the list of results.
Note: Windows Vista Anytime Upgrade is no longer available. The only upgrade option is to upgrade to Windows 7.