Changng multiple users address in AD

How do I change the office address for all users in a particular container – ie all users in the Liverpool office need the office address changing and I am sure I have done it before but for the life of me cannot remember how?

Am using AD with exchange 2003 – so should do this from the AD mmc for individual users – I just don’t want to do it individually for all of them!

cheers

Paul C