As Mobile Marketer reports, while BlackBerry is the most widely used smartphone system in the United States, with 43 percent of the market, its application strategy seems to have failed.

Research in Motion's BlackBerry App World is significantly less crowded than Apple’s App Store. As of the beginning of this year, there were around 150,000 applications in iTunes, whereas BlackBerry App World had between 10,000 and 15,000 applications and Android was slightly higher, but in the same ballpark. There is not too much going on in terms of branded BlackBerry applications and it is rather ironic considering its marketshare.

Apps are slick things - but not on a Blackberry. iPhone users (and brands) love the good-looking, easy to use nature of iPhone apps (although many are downloaded and used once only), while Blackberry users are quite content with the built-in features - after all, it's a mobile phone and email device, predominantly for business use. With 43% market share RIM are probably not too worried about a few missed app sales.