Bought by Xerox in a $6.4 billion deal announced in September 2009, Affiliated Computer Services had made a name for itself in business process outsourcing. The solution provider will substantially add to Xerox Services through its service contracts with government agencies, health care providers and insurance companies. Roughly 40 percent of ACS revenue comes from government contracts. In addition, with health care projects revving up as companies take advantage of federal dollars that are available for electronic medical records systems, the ACS portion of Xerox' business should see continued growth. ACS came in at No. 23 on the 2009 VAR500 and at No. 21 on the 2010 VAR500, which will be it's last year on the list as an independent company.