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BES is a middleware program that allows BlackBerry devices to access corporate messaging and collaboration software such as Microsoft Exchange, Lotus Domino and Novell GroupWise and BIS is BIS stands for BlackBerry Internet Service. It gives your BlackBerry access to the Internet. It’s like an ISP, but for your smart-phone instead of your home computer. Every time your BlackBerry gets an email, or accesses a webpage
bes(blackBerry enterprise server) its allows BlackBerry devices to access corporate messages and bis (blackBerry internet service) much like an Internet Service Provider (ISP) and its allows you to access the Internet via your BlackBerry. BIS connects with the Internet for email and data delivery, as well as for viewing web pages and other online functions.