Windows Metafile Format - Is this the best way to create vector art
for MS office
(submitted to Google Answers and experts-exchange)

I want to create vector (not bit-mapped) art (logos, etc) for
importing into MS Word and PowerPoint on windows.  I created all these
graphics in Adobe Illustrator.  I need a format that will accurately
interpret the image (e.g. NOT change the thickness of lines, NOT
change font characteristics).

I noticed that Adobe Illustrator can export as Windows Metafile.    

#1 - Is Windows metafile the best format?   

#2 - Is there any other windows vector format that is widely supported
and importable into Office.

#3 - I once created an EPS and was able to import and view it in Word,
but when I tried this on another project, it imported, but I was not
able to view it (no preview image).  Same on subsequent attempts.  Any
clues as to what variable I missed the 2nd time?

#4 – I heard that you could import an PDF, but that it wasn’t workable
for a logo (not sure what the reason was).   I also heard it may
change things like the thickness of lines (i.e. not interpret the
image correctly).

On creating picture to be as much accurate as possible on import by
others, your choice was correct, Vector format. I think all vector
format documents are designed to be like that.

For the comment on "NOT change font characteristics", this is depends
on the target machine's font library. Of course, you can render the
font itself to become a raster within the vector, which makes the text
stayed the same.

#1 - The Best? 
Probably not, but good enough. But for this purpose, where you are
using Windows, the Windows Meta File surely fit in nicely. I saw
others, like Enhanced Meta File, but I can't see the difference much.

#2 - Widely supported and importable to Office
Try CGM (Computer Graphics Metafile), which was widely used in the old
days.

#3 - Missing Preview
I'm not using EPS and Adobe Illustrator, but my guess is the 'save
preview' or 'include preview' check box somewhere when you saved was
not enabled.

#4 - Import a PDF?
Well, imported PDF (to Word) will be most likely become a Raster
Image. So that will explain the 'change of things'.

Hope this helped.