But there are big differences. RIM made its name supplying companies with everything they needed to provide wireless e-mail, from the software for handling e-mail to the BlackBerrys themselves. Microsoft, Visto, and others concentrate on software to handle wireless e-mail, letting companies like Nokia (NOK ) and Motorola (MOT ) make the gadgets themselves. That diversity of devices is one reason for Visto's recent wins. Another: It's cheaper. Brian A. Bogosian, Visto's CEO, says the company charges carriers less than RIM, though he won't specify pricing. Ewald says Visto's service will cost subscribers $15 to $30 a month, compared with $30 to $50 for Nextel's BlackBerry.