Hi Stephen,
First of all, thanks a lot for your help.
I finally have proceed like you told me first. It works fine, of course, but I (and especially my bosses) don't really like the use of windows schedule task.
So one of my new objective will be : succeed to use the community ODBC adapter by adding the proper code.
To sum up, I'm a little bit disappointed that I don't have any feedback from the community adapter on GotDotNet and I promise that when my MySql or ODBC adapter will be ready to work, I will send the source and documentation to BizTalkGurus.com, if you are interested.
Kindest regards.