Outlook 2003 error "An internal support function returned an error" with multiple distribution lists

I posted this to microsoft.public.outlook.general a while back and
didn't get any responses so I thought this might be a more appropriate
group. Any help would be appreciated:


Our users are getting the following error when trying to send an email
to multiple distribution lists:

"An internal support function returned an error"

When either one of the distribution lists is selected by itself,
everything works great. However, when two or more distribution lists
are selected, they get this error. However, if the distribution lists
are expanded, the email work fine as well.

Any thoughts?

Thanks,
Bill