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As part of the preview, eBay, MSN Carpoint and CNBC on MSN Money have deployed .Net Alerts in the US. More than 20 companies - including NASDAQ and Adopt - will begin offering the service to US users in the near future.
Christopher Payne, vice-president of .Net My Services at Microsoft, said: "In addition to providing convenience for consumers, .Net Alerts also will jump-start new ways for businesses to serve existing customers and attract new ones."
John Delta, vice president and general manager of NASDAQ.com, added: "Microsoft's .Net Alerts is a great Web service for investors, enabling them to track movement in the stocks that they are most interested in."