I want to make sure I have my directions down correctly:
1) I take the S-Bahn from the Munich airport to Muenched-Ost Station then board a train to Salzburg, using a "Bayern ticket", once I'm in Salzburg I take any of these buses to old town (#1,3,5 or 6)
I've never been to Austria or Germany and find that the folks on this Forum are very helpful for those of us how like to travel through the "backdoor"
Don