In an effort to shave market share from Google, Microsoft is using OpenX’s open source technology to offer publishers free ad-serving technology for their websites.
As part of the multi-year agreement, Microsoft will get access to a major distribution channel through OpenX’s community of more than 150,000 websites that serve more than 300 billion ads each month. OpenX will be the preferred partner for Microsoft’s enterprise ad-serving business and will also promote Microsoft’s Content Ads.

