We have a fairly significant BBOS 6/7 user base in the corporate sector but with what's happening to RIM at the moment we can't come close to justifying that sort of rewrite when we could be putting that effort into Android or iOS.
Anecdotally even Windows Phone is getting more interest from our corporate clients, all (literally all) of our BB customers are seeing RIM as dead in the water and looking to move away.
Now we're in a particular niche but it's one where 18 months ago RIM looked like they might own it, now it looks like it's all over for them here at least.