Has there been anyone working to make a comprehensive locally-hostable webmail/weboffice suite that replicates Google's functionality? I can imagine that this w

Has there been anyone working to make a comprehensive locally-hostable webmail/weboffice suite that replicates Google's functionality? I can imagine that this would be quite poular. Sure, some of the features like Priority Inbox might require complex heuristics, but things like labels should be easy to add support for.