One of the major reasons for selecting Flare is our need to produce alternative format output.
With PDFs, having a Hyperlinked Index is a huge plus, but sadly Word does not have this feature.
However, I came across a Word Add-in called "Index Linker" which converts Word's Index page numbers into Hyperlinks.
It's not free, and be assured I have no commercial interest, but at $49.95, it does what it says on the tin.
http://www.editorium.com/IndexLinker.htm
George