ok the dumb admin is me !
I upgraded to IMP3.1, but rpm -Uvh'ing file by file, in an order that didn't respect the dependencies order...
I then got a "welcome to horde" message instead of my usual "welcome to IMP"... and nobody can connect to this

I decided to try a "going back", reinstalling the original rpms using rpm -Uvh --oldpackage. But if was even worse, I had no welcome message.
So I then tried to rpm -Uvh *.rpm, in order to respect the dependencies order, but I still get stuck at the login because none of my userlogin/userpass are accepted.
If anyone has any idea on how to correct such behaviour, and go back to a working IMP (I really need a working webmail), either the 3.0 or the 3.1, I would greatly appreciate the help.
Frej