Check out how federated search is different in SharePoint Server 2010 …
September 17th, 2010 by Grace
What is Federated Search in SharePoint Server 2010? A Federated Search in SharePoint Server enables you to display search results for additional content that is not crawled by your search server. Using Federated Search, the query can be performed over the local content index, or it can be forwarded to an external content repository where [...]