from: http://www.engadget.com/2011/09/08/microsoft-adds-acer-viewsonic-to-patent-licensing-list/:

You can go ahead and add Acer and ViewSonic to the long list of Microsoft’s patent licenses . This morning, Redmond announced a pair of new licensing agreements with both companies, a few months after striking similar agreements with Itronix and Velocity Micro . Details, however, are few and far between, with Microsoft, saying only that it will receive royalties from ViewSonic and the patents in question relate to both companies Android tablets and smartphones. Of course they do . The two press releases await you after the break.