Apple reverse engineered a file format, Beeper reverse engineered a protocol.

Microsoft made several changes to try to keep Apple out, Apple's also made several changes to keep Beeper out, except now everyone's online so it's happening way faster.

It's not exactly the same kind of reverse engineering, but I never said it was. I think you've got a very narrow definition of reverse engineering in your head and you're quibbling over me using it more broadly than you would.