I'm more of an MSDN user than Technet, coming at architecture from a solutions development background, but this article interested me as a nice reminder of some of the common doors that are often left open to intruders - http://www.microsoft.com/technet/technetmag/issues/2005/01/AnatomyofaHack/default.aspx
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My US colleagues Chris, Felipe and Don (all key contributers to the ws-* specs over the last few years) have just released an updated version of the Web Services Architecture paper that describes the design principles underlying the architecture and foundational
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