Who Would We Miss? Microsoft, Yes. Apple? Sort Of. RIM, Definitely.
RIM: Very Big Deal.
The BlackBerry is different. The main reason it got so popular in business and government is that it's a highly secure system in which traffic is encrypted and all that Blackberry traffic goes through RIM's servers. Remember the great three-day Blackberry outage last year? There aren't enough iPhones available to handle the crush of industry trying to get something that works.