(CNN) — On street corners, in train stations and in restaurants, the telltale signs of BlackBerry addiction are everywhere: pursed lips, a distracted look, thumbs working furiously. People don’t just use BlackBerry; once they’ve discovered it, they can’t live without it. Though it can be used as a phone, the BlackBerry’s power lies in its ability to push e-mail automatically from the company server to the end user. That simple concept has revolutionized corporate life. Two million BlackBerry subscribers have already signed up and their numbers are growing rapidly.
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