If you want to use Groupwise as your mail client you need to use the SuperOffice inbox. Note - we do not officially support Groupwise 7.
The gateway client needs Outlook, and must change the mail template (*.som files) so it's similar to this:
[SoMail]
Padd=<padd0>
Subject=<head >
[SoMaGate]
Name=<mgdn >
Address=<mgma >
[From]
Address=<auem >
[To 1]
Address=<atem >
[Message]
-----------------------------------------------------------------------
<auth >
<atit >
<onam >, <ocit >
mailto:<auem >
Phone: <opho >
Fax: <ofax >
<MailRef>
-----------------------------------------------------------------------