Bela,

Thank you very much for your reply!

Does it mean that the problem only occurs if I try to create the MAPI components from CREATEOBJECT() and ADDOBJECT() functions?
I am confused because some client machines does have MSMAPI32.OCX and other don't. I need to make sure that my solution will work in systems using Outlook 98/2000, Outlook Express 5+ and Eurora 5+ (with or without Exchange). Do you have any other recomendations to me?

Thank you very much!
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Fabio.