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The U.S. computer services industry is back in favor, after a decade of struggling to cut costs and compete with offshore firms from India and elsewhere. At least that would be the obvious conclusion to draw from a recent string of multibillion-dollar deals.

Xerox has agreed to buy Affiliated Computer Services for $6.4 billion while Dell is paying $3.9 billion for Perot Systems. They are picking up where Hewlett-Packard left off when it paid $13.9 billion to buy Electronic Data Systems in 2008.

But what's driving these deals is not a bet on the improving growth prospects of the services industry. Instead, the buyers value computer services companies more as sales pipelines for their own products.

Take Xerox, which has struggled for years to move beyond copiers. The idea now is to manage information in both printed and paperless form. ACS is a leader in processing health claims and student loan payments for governments. It helps commercial clients cut the costs of payroll or human resources processing.

So don't think of this deal in terms of the traditional revenue synergies used to justify technology mergers. It's about helping commercial and government clients cut costs, a tight margin business in the best of times.