From Authentication Tools for Joomla! (JAuthTools)
This page contains some relevant information for those interested in upgrading in one place.
Joomla! 1.0.x Mambots
After installation of the mambots, upgrading typically only involves writing over the top of them since they do not touch any database sections. It is suggested that you edit and save any mambots after update to check that any new settings are available for your system (e.g. 1.0.0 to 1.0.1 added a configurable LDAP group attribute option, mainly for AD users).