Hi Sergey

Thanks! again for your attention. I would like to explain how the problem was solved. Really we dont know why, but you know, under pressure your imagination works.

We didnt have time (or make it) to write the code example for re-create the error and the application is big ( 7 MB ) for send to you. So let me tell you that the solution was writing the code for create the cdo message object in the main program (before create the application class and call the main menu) and magically the error dissapears. Again dont know why but actually the application is running without problem.

Thanks again and as soon as we can send to you the code for analysis.

Gracias!