Blackberry built their reputation on rock-solid integration with enterprise e-mail (basically Microsoft Exchange). They had mobile e-mail years before anyone else; now everyone and his brother has push notifications of e-mail to their @aol.com address or whatever. There was a time when businesses paid top dollar for their employees to have that.

I'm not sure what they have to offer now, I fear that they might be threatened in this new ecosystem of mass-market smartphone ownership.