I've raised this issue on the Microsoft forum.
I got a very quick response, but not an answer I was hoping for. Basically, EM2 doesn't read Indesign's XML data. I think Illustrator files have the same problem.
Here's the response from Microsoft:
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"I tested on CS4, which is the only trial download I could find, and can replicate your issue. Looking at the advanced tab in file info, you can see the XML that's saved for the keywords, etc. They are in a section that looks like this:
Schema (
http://purLorg/dc/elements/1.1/ dc:format: application/s-indesign
dc: subject(bag container)
[1]: keyword1
[2]: keyword2
where keyword1 and 2 are the actual keywords. The only difference I can see between the InDesign file and a TIFF, is that the TIFF says it's dc:format: image/tiff.
So more than likely the file format is short circuiting reading those keywords. I tried it the other way around, writing the keyword in Expression Media and syncing to the main file doesn't carry through to Bridge. I'm afraid that I don't have any good answer for you, unless you keep your annotations in one application or the other.
I will file a request for InDesign annotations to be read in Media."
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John, thanks for pointing me to this forum.
-David