As the long wait for BlackBerry 10 devices continues, rumors continue to swirl that RIM may engage in some radical restructuring at some point — including selling off parts of its business. The latest comes from Bloomberg, reporting that its sources indicate that IBM has "made an informal approach" to acquire RIM's Enterprise Services unit. Apparently, the board rebuffed IBM's interest because it still wants to wait and see what will happen with BB10. That's the same attitude the board reportedly took with regard to selling off other RIM divisions, so it seems like the company is bent on getting BB10 out the door, albeit later than originally planned. Should things not go well there, we imagine that IBM could come knocking on RIM's door again — after all, as RIM CEO Thorsten Heins put it, "enterprise is "where BlackBerry lives best."