Antonio,
Chances are your running into the VFP6 bug documented in KB article Q192693
There is a workaround in the article.
If your using CreateObject() to create your mapi class, this bug will appear.

-Ed

>Hi Nigel,
>
>I tried using your MAPI class in an application I´m developing for a customer. With my PC it works fine, but when I run the app at my customer´s site, I get the following error message:
>
> "OLE error code 0x80040112. Appropriate license for this class not found"
>
>The only difference between both systems is that I have Outlook Express as the MAPI client and my customer has Exchange 4.0
>
>What license am I missing ?