[Mailman-Users] import 2.1.9 lists to 2.1.12

[me at electronico.nc]

Hi all,
I have had an old server crash, running Ubuntu Hardy and Mailman 2.1.9.
I have setup a new server, running Ubuntu Jaunty and Mailman 2.1.12.
Is there a way to import Mailman 2.1.9 files (lists, users, archives, 
etc ...) to the new 2.1.12 Mailman server ?
I have all the content of /var/lib/mailman from the old server.
Thanks in advance for any advice.
Nicolas Canonne