The large number of add-ins delivered from numerous vendors means that we sometimes find conflicts when implementing Duet into environments with existing add-ins. In our experience the most problematic add-ins for Duet are archiving related add-ins, however all add-ins should be tested in your environment.
Please follow link below to the Microsoft Technet Blog detailing this topic @ blogs.technet.com/duet
Are you using additional add-ins with Duet? Continue the conversation by adding your comments on this posting. Share your findings with us and the rest of Duet community. Together we can build a full reference of known add-ins that function with Duet.