Re: @AC "far fewer vulnerabilities"
You do know that the source of your "information" is a microsoft employee - don't you ( and the 'report' is also 6 years old ). Is that the best you can do - go ask The Vogon
I also suggest you read your own 'refs.' (snigger). The secunia one includes :-
PLEASE NOTE: The statistics provided should NOT be used to compare the overall security of products against one another. It is IMPORTANT to understand what the below comments mean when using the statistics, especially when using the statistics to compare the vulnerability aspects of different products.
A direct and fair comparison of unpatched issues for e.g. Microsoft Windows and Linux distributions is therefore NOT possible using the aggregated Secunia statistics