Banyan Vines is a network client and server system. It consists of it's own unix based servers, it's own network protocol and client, enebling internal and external email, file- and printservices, etc. Banyan Corp does not exist anymore though. I believe it has been bought by MS. There is a beta-version of the client until win2k, but there was no official development anymore at that time. Hope that answers your question?
Dolf.