The ones suffering are Microsoft. (IMHO) I don't think that many of their corporate customers are still considering investing in their software. This could be a huge turning point for them.
And unfortunate or not, I think they deserve to lose customers. Actually, I am surprised their stock is not plummeting right now.
Think your perspective is a bit off there if you think this should be causing a stock meltdown or a mass exodus. Most people, rightly or wrongly, probably aren't all that interested in Microsoft's involvement, but more concerned about where Snowden is and whether he's leaking our classified information to other nations. Yes, there are people upset at the tech companies and the NSA, but I don't think it's nearly as widespread as it is in the tech echo chamber.
EDIT: To clarify, maybe this SHOULD cause a mass exodus in an ideal world. But I don't think that matches up with reality, and therefore I don't think a mass exodus/stock meltdown is really an expected outcome.
The people in charge of buying software and services buy what they are told to buy by their bosses. The bosses making those decisions oftentimes are uninformed and unconcerned with the things you might imagine that they would be.
I know its fashionable to bash Microsoft but give me a break.
Why focus just on tech what about all those financial transactions flowing through Wall Street. Is everyone going to start banking in Antarctica now?
What has happened with American tech companies wrt the NSA can happen to any company anywhere in the world holding data. If the government walks in one day, and says give me the keys, lives are on the line, most people I know will hand over the keys.
Most big "enterprisey" customers who use MS servers or exchange or office etc. aren't even remotely contemplating about switching to anything else. That's a pretty safe business for MS at this moment. That will likely change, but it's hard to predict when.
So they should invest in Google apps or Apple? The first leak from Snowden showed every top company is helping NSA and by law ordered to lie. The whole thing sucks for US tech ..
And unfortunate or not, I think they deserve to lose customers. Actually, I am surprised their stock is not plummeting right now.