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Interesting item
<http://news.com.com/Linux+lasting+lo...ks/2100-7349_3
-5501278.html> says that even unpatched Linux installations out of the
box last much longer than Windows systems against Internet attacks.
Whereas Windows is typically compromised within minutes, the Linux
systems can resist attacks for months. And the security of Linux has
actually _improved_ over the last few years, even as its popularity has
grown by leaps and bounds.

This other study
<http://news.com.com/Security+researc...ewer+flaws/210
0-1002_3-5489804.html> suggests that Linux has a lower-than-average
incidence of bugs compared to typical commercial software.