NEW YORK (Reuters) - Xerox Corp said it will buy Affiliated Computer Services Inc in a $6.4 billion cash-and-stock deal that expands the copier company into outsourcing and data management.

The deal, priced at a 33.6 percent premium to ACS's Friday closing price, is the latest in the active technology services sector. A week ago, Dell Inc said it would buy Perot Systems Corp. Hewlett-Packard Co may sell part of its outsourcing business.

Xerox will pay 4.935 Xerox shares and $18.60 in cash for each share of ACS, totaling $63.11 per share based on Friday's closing price, the companies said in a statement on Monday.

Shares of ACS, which competes with Accenture Ltd and Computer Sciences Corp in data center management, jumped 22 percent in pre-market trading. Xerox shares fell 9.6 percent to $8.15.

Ursula Burns, chief executive of Xerox, said revenue from services will triple to an estimated $10 billion next year from $3.5 billion in 2008.

"Customers are saying, 'We need help with the entire document infrastructure.' We've got the technology piece of the back office and the technology piece of automation. We need help with the information piece," Burns said in an interview.

Xerox assume ACS's debt of $2 billion and issue $300 million of convertible preferred stock to ACS's Class B shareholder. On an adjusted earnings basis, the deal is expected to add to Xerox's earnings in the first year.

Xerox said it would become a $22 billion global company after the deal, of which $17 billion is recurring revenue. It expects annualized cost savings of $300 million to $400 million in the first three years after closing.

The deal is expected to close in the first quarter of 2010.

J.P. Morgan and Blackstone Advisory Partners acted as financial advisers to Xerox for the deal, Citigroup Global Markets Inc was financial adviser to ACS and Evercore Partners was financial adviser to a special board committee at ACS.

(Reporting by Franklin Paul and Tiffany Wu; Editing by Derek Caney)