Quite a few times I’ve been thwarted by microsoft.com’s search engine. My usual workaround was to go to Google and do a domain-specific search e.g. “outlook 2007 calendar hotfix site:microsoft.com”. (Don’t worry about remembering the syntax of the site: bit, you can do the same from the Advanced Search page by filling in some boxes.)
I guess this must be a pretty common thing to do, because Google have a page that does the same thing with less typing: www.google.com/microsoft. I’ve just added it to my shortcuts.
There’s a list of ‘special’ searches here: http://www.googleguide.com/special_searches.html.