To provide these notifications in real time, the wireless wide-area network modules from Novatel Wireless securely connect through HSDPA and EV-DO networks to the Microsoft Exchange Server, storing user information and filter policies.

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Dick Lynch, chief technology officer of Verizon Wireless, explains that no wide-area wireless network can afford to build out wide-area data capacity to handle bursts of demand for wireless data that change from airport gate to gate every 30 minutes or so.

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Now that wide-area wireless network operators recognize Wi-Fi hotspots as complementary to their advanced packet-data networks, they will end up owning or leasing most of today's hotspots and will build out coverage.

FORBES: Will 2003 Be The Year Of The Hotspot?

The tablets were too bulky, too slow, too expensive, and wireless connectivity had not yet advanced to broadband Wi-Fi and wide-area network services.

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