In the current version of the DirectorySynctool, the name of the ActiveDirectoryDomainService managementagent is Active DirectoryConnector; in previous versions, this management agent was called SourceActiveDirectory. The ActiveDirectory Connector uses ActiveDirectory GUID as the SourceAnchor (link between ActiveDirectory and Office365 Object); this is automatically set, and in DirSync this link cannot be changed (unlike in full FIM 2010 R2).