Microsoft Office Genuine Advantage Closed quiet.

Office Genuine Advantage, or OGA anti-piracy technology is the same, but the WGA for Microsoft Office that people who want to supplement or to download a template from Office.com OGA must pass before it is available.

But there are reports that Microsoft OGA closed quiet without clear reason. And web pages related to validate as genuine, it is removed from the site of Microsoft.

OGA off about not activate when installing Microsoft Office programs still need to put the key in the WGA was not altered.

Source - Blognone, ZDNet.