[boost] Unordered Map/Set in VC++/Boost?

Hello, I wanted to use hash maps in VC++, but it seems that they have only an old implementation, but not the tr1 unordered_map type. Actually the hash_map would have been fine if I could use it with the boost "hash" class. Anyway, after searching a bit on google, I've found a page where is mentioned something about boost having an implementation of the unordered_map. So my question is: does boost or does it not contain the unordered_map, and if not, then anyone has any idea how I could use the boost hash class with the VC++ (2005) hash_map class? Thx in advance, Peter