Comment 2 for bug 506985

Release notes from 1.7.0:

   http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/attachments/20091007/3aaed239/attachment.txt

Quote:

  Upgrading
  =========
  The database schema has not changed since the 1.6.0 release, so user
  accounts, durable exchanges and queues, and persistent messages will
  all be retained during the upgrade.

  If, however, you are upgrading from a release prior to 1.6.0, when the
  RabbitMQ server detects the presence of an old database, it moves it
  to a backup location, creates a fresh, empty database, and logs a
  warning. If your RabbitMQ installation contains important data then we
  recommend you contact <email address hidden> for assistance with the
  upgrade.