• by Mark Walsh  @markfwal, March 15, 2012

The display ad-pooling partnership announced by Yahoo, AOL and Microsoft in November is now operational, with the companies now offering each other’s unsold inventory, according to a Yahoo blog post today. The alliance was formed to help the traditional Web portals expand their reach for advertisers while aiming to stem inroads made by Facebook and Google into the display ad space.

Yahoo’s and AOL’s non-reserved inventory on premium pages will be offered through Right Media Exchange, while Microsoft’s inventory will remain on the Microsoft Advertising Exchange at launch. Read more here.