Well, OK. People don’t write many viruses for the Commodore 64 either. I guess that makes it the best of all.
Perhaps, if your going for the "nobody uses it so that makes it secure" argument. Or it's corollary, "Lots of people attack Windows, that's why it has so many bugs," which is false.
There are millions of Linux web servers. Somehow they don't get compromised. That shoots down the idea that a well-used OS can't be secured. It also shoots down the idea that only Windows is used a lot.
The reality is that Windows is malware-ridden because Windows is bug-ridden. And bugs come from the factory.
And that's Microsoft's fault.
True... but those C64s are nowhere near the 40,000,000 OS X Macs, 99% of them running bare-assed naked on the internet...