What is OGA?

Just like the Windows Genuine Advantage validation tool, you can also check whether your installation of Microsoft Office products is properly licensed or not, using the Office Genuine Advantage (OGA). Again, you can do this online by opening this link in your browser. You will be required to install an ActiveX plug-in for Internet Explorer that will validate your Office installation. In case validation fails, you will receive helpful steps on how you can acquire an original license for your PC.