One of the missing features in Outlook 2007 is the ability to preview PDF files, like JPG, PNG, XLS and WORD documents. So, I am impressed to see a PDF Viewer for Microsoft Outlook. Whilst this is not an 'Official' PDF integration, the programmer who wrote the PDF Viewer actually does work for Microsoft I believe.

The way that it works is that it actually uses the ActiveX PDF control to display the PDF file. I am guessing that the reason that it works this way is so that Adobe cannot do a Anti-Trust thing against Microsoft.