They did subsidize a number of major apps that come over to BlackBerry.
"In a recent study, researchers Raquel Alexander and Susan Scholz calculated the total amount the corporations saved from the lower tax rate. They compared the taxes saved to the amount the firms spent lobbying for the law. Their research showed the return on lobbying for those multinational corporations was 22,000 percent. That means for every dollar spent on lobbying, the companies got $220 in tax benefits." http://www.npr.org/blogs/money/2012/01/06/144737864/forget-s...
Subsidized, and even subsequently outsourced development to other companies, though I realize this isn't necessarily unusual. It just isn't made public.