From Munich airport one takes the S-Bahn line S8 and gets off at Ostbahnhof.
We are planning to organize a conference bus which will leave from the Ostbahnhof.
As for the train connection Munich-Prien, the trains leave from Hauptbahnhof, but do also stop at Ostbahnhof (timetable).
For connecting with the Server of Deutsche Bundesbahn click here.