InDesign CS5, Mac Pro, 10.6.8
When I make an interactive PDF from InDesign, it has clickable email links you can set up.
That's the UTF-8 code for a curly apostrophe. It seems Outlook doesn't recognize UTF-8 (at all, or correctly, or in just subject lines--ask Microsoft).
Use a straight, non-typographic apostrophe instead. Switch off Typographic Quotes or use the hotkey combo; it's something like Alt+', about that area.
That did it!
Thanks a million Jongware!
For anyone else with the problem, I did the following
PREFERENCES > TYPE > untick 'use typographers quotes'