Golfbaum, true enogh. But if IBM had a patents that applied, don't you think they would already be pursuing HP or Lenovo for infringement? Also, you could license IBM's relevant patents for a lot less the a billion. Witness the fact that they license their state of the art process tech for a couple of hundred million -- maybe less to chartered.
Edit: Not to mention that there may already be cross-licensing agreements in place.