Gunmen Set Fire to Microsoft’s Greek Headquarters

I'm truly baffled by what they were protesting, here. I'm no MS fan, but I haven't heard of any particular ire pointed at them for anything, much less the troubles Greece is going through now. Was this just a wanton act of petulance?

I think it'll be hard to guess unless more evidence surfaces. With a machine gun, gas canisters, etc., it sounds pretty organized, not a random splinter group of angry students or anything. The "mass" left movements (KKE, Antarsya, various squat-based anarchist groups, etc.) tend not to carry out military-style armed actions like that, and are more into the mass marches with Molotovs and rocks. There could be a smaller group that chose MS as a convenient target (probably it was less well protected than banks or government building are). But even those, when they do something "big", tend to try to make a PR stunt out of it, e.g. unfurl a big banner on the front of the building and spraypaint slogans. This looks more clinical in a way, which makes it look more like a pointed threat than a protest.

With the current high unemployment and general anger, there are a lot of questionable groups in weird webs of entanglement in Athens, so could be other things as well. There are some violent right-wing groups who might be coming from nationalist rather than leftist reasons (out with the foreigners/etc.), or it could be something apolitical like organized crime. The latter is getting bigger as groups of desperate people are looking for any way to make a living; in particular, many people suspect that some football-hooligan "ultra" groups have morphed into criminal syndicates. They're also sometimes associated with the Golden Dawn neo-Nazi group, though it's never quite clear how much of that is politics versus money versus general not-very-precisely-directed anger.

(As a side note, Athens vs. everywhere else in Greece are almost completely different places these days. Even as half-Greek I would be careful where I went in Athens right now, but the rest of Greece is much different.)

Too brazen to be Mac users.

I doubt this is a protest.

Either it's criminal violence targeted at the company (the protection racket hypothesis seems likely at this point) or it's something designed to destabilize the government even further. This second idea is less likely because, if that's the intention, a government building would be the target.

Also, the damage to the building itself seems rather minimal. The entrance is completely destroyed and some repairs may be required in the wiring, but the structure seems unaffected. I guess fire suppression systems worked as designed.