Microsoft staff use Google search engine!

Of the users originating from Microsoft's domain who reached Hitchcock's site via a search engine, 80 percent came through Google. Only 20 percent used a Microsoft search engine (either MSN's or the Live.com's). More...

And Google folk use Google 100%. IMHO, this is more a reflection on the staff at Microsoft, than the abilities of the engines. Anyone clued up on search engines would know that Yahoo & MSN results are quite similar to Google's, and if you worked for that company, using their search would help you to provide constructive feedback to their search department.

Then again, meta-search engines provide the best results.