Researchers question Microsoft's botnet take-down
Good in that they've done something. Bad because it's a minimal percentage of the total spam volume. When McColo was shut down a while ago, spam volumes dropped markedly but soon got back to normal levels.
I'd rather they made their operating systems more robust.
I'd rather they - as the predominant supplier of desktop operating systems, love them or hate them - helped bridge the gap between the technological cognoscenti and users. Make people more aware of what's going on behind their LCD screens and make it more transparent, make people treat the internet the same as any other social forum and use the same social screening techniques to avoid them getting their puters hosed with all sorts of crap.