T-Mobile USA will begin selling the latest version of Sharp’s Sidekick mobile e-mail device in the U.S. on Monday, Sharp said.The Sidekick 3 is Sharp’s first PDA (personal digital assistant) designed from the ground up to be wireless and includes an e-mail client, Web browser, MP3 player, instant messaging software for AOL, Yahoo and MSN networks, and a game player. Its predecessor, the Sidekick II, also came from Sharp but was based on a reference design from Danger Inc.Sharp plans to manufacture 100,000 units of the device per month and is also interested in expanding sales to Europe, it said on Thursday. Software DevelopmentTechnology IndustrySmall and Medium Business