In guise of competing with other Internet Companies such as the search service Google, in 2005 Microsoft announced a new version of its MSN search service. Later, in 2006, the company launched Microsoft adCenter, a service that offers pay per click advertisements, in an effort to further develop their search marketing revenue. Soon afterward, Microsoft created the CodePlex collaborative development site for hosting open source projects. Activity grew quickly as developers from around the world began to participate, and by early 2007 commercial open source companies, such as Aras Corp. began to offer enterprise open source software exclusively on the Microsoft platform.