Erik did a good one: http://bidwcz.blogspot.com/2008/12/chybjc-bi-office-add-in-me-se-to-stt-i.html But since most of you (including me :) ) don't speak or read Czech here is a translated summery:
If you a "missing" the OBIEE office plug in after you did an install and think it should be there, try this:
In your MS Office application grotto Help> About MS Office> Disabled Items >
Press Disabled Items and check if the OBIEE Office add in is the list.
Till Next Time