Blackberry is tops in 3 of the top 5 smartphone categories.
Why such success in the enterprise hyperconnected world?
Three reasons why it beat out the iPhone:
1) Enterprise fit, apps and security- R3 of iPhone will narrow the gap.
2) Carrier support: Blackberry is available from all top 4 US carriers, while iPhone is only available from AT&T. Remember that many enterprises have a preferred wireless provider, so this is a big deal for those that aren't with AT&T.
3) Blackberry is a more mature product in a market that they have created (at least in enterprise).
As the smartphone market matures, driven by consumers, expect to see more competition in the enterprise segment.