Xerox Corp. agreed to buy Affiliated Computer Services Inc. for $6.4 billion in its biggest purchase, shifting to computer services as sales of its traditional printing equipment decline.


The transaction will help triple sales from services to about $10 billion, Xerox said today in a statement. The total price of the cash-and-stock deal is about 34 percent more than Dallas-based Affiliated Computer’s closing price September 25, 2009.