Oh. I thought you were talkng about [link|http://news.com.com/2100-1001-935516.html?tag=fd_top|these].
But OSS is a security risk, and MS is the source of "trustworthy computing".
Right.
Let's see. They have holes in RAS, holes in IIS scripting, holes in SQL server, holes in MSN messenger, holes in chat, holes in Explorer - and the week ain't done. Most of these holes were found by independent researchers - not by internal review, so having the source code apparently doesn't give the 'cracker' an advantage when chasing the MS-Holey Grail...