supports push e-mail, mobile telephone, text messaging, internet faxing, web browsing and other wireless information services as well as a multi-touch interface. It has a built-in QWERTY keyboard, optimized for "thumbing", the use of only the thumbs to type. The BlackBerry devices soon took a dominating position on
the north-american smartphone market. Also important for BlackBerry are the BES (Black Berry Enterprise Server) and the Mobile Data System (BlackBerry MDS).
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