http://blogs.technet.com/b/stevenha/archive/2012/11/13/script-to-convert-an-ms-online-directory-immutable-id-to-an-ad-guid-and-vice-versa.aspxThis script can take an ImmutableID found in the DirSync Metaverse or via get-msoluser and output the GUID of the corresponding object from the SOURCE AD. It can also take the Source AD GUID and tell you what the ImmutableID should be.     Usefulen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)