I don't believe you can do this with outlook express - outlook express does
not support OLE Automation which I believe is what Ron is using. However,
there is a lot of code on his site, so I don't know specifically which code
you are using. If you are using some of his CDO based code, then it may not
be an issue with the OLE Automation part.

In outlook express, under tools=Options, in the general tab, there is a
button at the bottom that says make default if it isn't the default. If
you want to know how to do it in code, I suspect it is a registry entry, but
I don't know which one it is. Perhaps a gooble search.

--
Regards,
Tom Ogilvy

"Francis Ang" wrote in message
...
Tom, Can you help me again. I have tried the codes it works OK but how do
I change the default mailer to Outlook Express? The default is currently
Microsoft Outlook.