Nasdaq OMX Group acknowledged Saturday that a Web-based service that promised more than 10,000 directors of corporate boards that they wouldn't have to worry about their communications "being posted on the Web or landing in someone else's inbox" had "potentially" been hacked.

The exchange operator acknowledged in a statement on its corporate Web site that it had detected "suspicious files" on its servers in the United States. These were "unrelated to our trading systems," it said, but that a "web facing application" known as Directors Desk was "potentially affected."

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