NEW YORK :WNS Holdings, a technology outsourcing services firm with a market value of $2.8 billion, is exploring a sale after attracting acquisition interest from potential suitors including Capgemini, according to people familiar with the matter. WNS, which traces its roots to India, is working with its investment bankers at JPMorgan Chase to evaluate its talks with interested parties, which include French technology group Capgemini and other rival information technology services firms, the