I'd expect Microsoft and others will make an announcement. With MS's overly zealous security handling these days, I'd be slightly surprised to find out that they were transmitting in the clear outside their datacenter.
If there were actual taps _inside_ the datacenters, like on top of racks and so on, that'd be quite the spectacle.
"In one 2004 case, a civilian employee told NSA security that she had spied on a foreign phone number because she found it on her husband's cell phone and suspected he was being unfaithful."
Apple has gone on record saying they encrypt data and they don't store it in any recognizable form. I tend to believe that, as if it wasn't the truth, they wouldn't lie about it - they just wouldn't mention it. The fact that they would say that seems to indicate they're pretty confident it's true - if it turned out they were lying, the public backlash would be ruthless. So yeah, google's data is much more attractive.
Until very recently Adobe claimed the same. I'd be very careful about trusting such claims.