+If you provisioned a more recent Samba4 system already you should be able to
+use the procedures shown in "upgrading-samba4.txt" to upgrade it and keep all
+data.
+
+When you are using Samba3 at the moment you could try the experimental script
+"upgrade_from_s3" under the "setup" directory of the source
+distribution (it isn't included in binary distributions yet).
+