The Chinese got into gmail (Google) essentially on a whim to get David Petraeus' emails to his mistress. Ended his career, basically.
I'd bet my hat that all 3 are definitely penetrated and have been off and on for a while -- they just don't disclose it.
source: in security at big orgs
Disclosure: I work at Google but have no internal knowledge about whether Petraeus was related to Operation Aurora.
Considering the number of Chinese nationals who work for them at various levels... of course they're all penetrated. How could that possibly fail to be true?