Ok. I discovered that if I unreferenced the other references, then added rebex, then added the others I was able to add the assemblies from rebex.
However I get this error as stated earlier when trying to call a method that references i.e: imap dll, i get this error:
Could not load file or assembly 'Rebex.Imap, Version=6.0.8314.0, Culture=neutral, PublicKeyToken=1c4638788972655d'. The system cannot find the file specified.