Since the assumed OS following OS 6 will be OS 7, I would think that Microsoft would have a serious problem with using the 7. Think they'll bother RIM about the name?
with the adaption of QNX OS's i don't think we sell "OS7" and if we did, oh well. It's "Windows 7". i don't think, and if they can it's just plain stupid, they can sue over a number. we didn't see any suing when RIM, Apple and Android went through the 1-x phases. and they would of over lapped with each other.