Here is the transcript when Exchange talks to nntprss:
RSS> 200 nntp//rss v0.5-beta-1 news server ready
MSE> mode reader
RSS> 200 Hello, you can post
MSE> date
RSS> 500 command not recognized
MSE> newnews * 050701 234054 GMT
RSS> 230 list of new articles by message-id follows
RSS> .
MSE> quit
RSS> 205 closing connection - goodbye!