Best for Joomla 1.5 sites
Not recommended for 1.6
Thank you for your review.
The version for Joomla! 1.6 uses the same code basis. Why don't you ask first in the forum for help? I can't reproduce the behavior on my test-installations.
Since uddeIM stores messages obfuscated or encrypted in the database to ensure the confidentiality it is not possible to provide a Joomla integrated search. A uddeIM integrated search might be possible but this would mean a sequential decoding of each message which will exceed php time restrictions on most systems. So you have to live with the filter capabilities which are already available.