No, I am saying that Apple didn't do due diligence. if you think that all is needed is a search at USPTO you are sadly mistaken. Apple was not serious when it registered iCloud. They of course looked at who was registered, but clearly dismissed the ones that were not. I think that you assume that when registering a trademark that it is a simple go an search the USPTO and that is it. I believe Apple probably knew all about iCloud Communications but decided that it was easier to ignore it and plead ignorance. There is precedence for companies with unregistered trademarks being victorious if they can prove prior usage of the name for the purpose of conducting business and of course being in the same general business.
As well, a serious company doesn't need to file a patent for every invention. It makes it a hell of a lot easier to battle it in court though! Again prior art from an unregistered entity can invalidate patents that are registered.
Companies that may not patent everything or register every trademark does not mean they are not serious - but they definitely make it harder on themselves when they do have to fight.