About 3/4 of the way down this page -
http://technet.microsoft.com/en-us/library/cc297193.aspx - you will find the phrases "Office Server Enterprise Search" and "Office Server Site Search". I suspect both phrase appear in many other TechNet and MSDN pages. However, using "Search Technet with Live Search" the only hits I (currently) get are in forums.microsoft or social.technet or social.msdn. I get the same lack of (expected) hits in search.live.com (and in Google for that matter).
For example: "Office Server Enterprise Search" site:microsoft.com
This produces only 9 hits in search.live.com (same with Google)
It seems odd that none of these indexes hit on the page whose link I've embedded here - as well as many other non-fourm, Microsoft-authored pages. Can anyone explain?