>>UPDATE. I guess I figured this out - OP - original poster.
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>>I was just contradicting Dragan's statement. At least in my tests for the Word document file the properties were preserved by e-mailing. So, it could be that some files preserve these properties and some don't, we need to find out which and how.
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>Well I believe that your attempted contradiction of DraganN's statement was WRONG.
>Dragan, I believe was referring to the "Properties" one can view when rt-clicking on a file name and selecting "Properties" whle it appears you are referring to the INTERNAL properties of a Word document.
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>>For adding custom properties for the DOC files programmatically I already provided a link in my other message in this thread.

I right click on the File and see the Summary tab properties. These are the properties I was talking about.

Try it yourself with any Word file.