Actually, last two or three years,
I remember there's community that test which OS is more secure.
They install Mac OS, Fedora Core and Windows SP1.
All from the original CD without any updates and guess what?
Windows is the most secure OS without updates, Mac is first runner up and
FC is second runner up. And after they install updates,
Mac is at the first place of most secure, FC is still at second place and
Windows fall to third place.
Please remember that that test does not mean which OS is easier
to be affected by viruses or malware or adware, or which OS restart frequently,
they test in the aspect of security flaws, based on how many 'flags'
they manage to put in each OS.
Well at that time it was Windows SP1, Mac OS Panther and FC 3 or 4 I think.
Don't know what is the situation now. But I believe their test because they're all
from Open-source community - which of course won't support Windows.
But yes, they still tell the truth.
Sorry I could not remember what is the community name.