When you try to preview a PDF file in Outlook 2007 it says:
This file cannot be previewed because of an error with the following previewer:
PDF Preview Handler for Vista
To open this file in its own program, double-click it.
You can open and save but not preview.
For those that would like to preview first I have found a great piece of software called foxit. Download and install and you will be previewing your PDF attachments again.
See Life Hacker for more details.
http://timheuer.com/blog/archive/2008/05/09/foxit-pdf-preview-handler.aspx
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