It's rare that I'm the one to state the obvious but what the heck's up with Windows Vista & Office 2007 not providing a Preview Handler for the .XPS format?  Isn't a .XPS Handler obvious?  Shouldn't I be able  to view a .XPS file in the Outlook Preview Window in the same way I view a .DOCX file or a .PDF file if I have the right Preview Handler installed?  Or do the same in an Windows Vista Explorer window when using the Preview feature?  (See picture for how to turn this on)  This in my opinion is a gross oversight and I'm curious as to why we left one out.

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Microsoft, XPS, Outlook 2007, Windows Vista