Recently Google have indicated they are abandoning Microsoft for desktop usage, as a result of the Aurora incident earlier this year. Microsoft look like they have something to say about this. I find myself siding with Microsoft on this. What Google are really doing is taking a knee jerk reaction to the incident and instead saying we will change operating systems thinking this will make us more secure. This is a cut and dry example of "security through obscurity" which we know DOES NOT WORK.
I am hardly a Microsoft fanboy, but there are clear industry lessons everyone can learn from them. Adobe, Oracle and Google - I'm looking directly at you.
If Google are serious, why don't they force a migration to Windows 7, have a hardened build with whitelisted apps out of the box or look at completely segregated (if not offline) dev/test environments? There are plenty of companies that do this already.
If Google think moving to Linux or Macs is going to save them or reduce the attacks against them, then as Schneier would say, they simply do not get it.
Knee jerk reactions never improve security. Thoughtful, measured, planned responses do.