A more portable/standard way is to use launchUrl Frontcall using the mailto protocol (see
http://www.ietf.org/rfc/rfc2368.txt). You would be able to set to, subject, cc, body and even attachment fields content with some limitations (see for example
http://forums.devshed.com/beginner-programming-16/using-mailto-with-an-attachment-66699.html).
This would work with GDC and GWC but I did not test what part of the rfc2368 outlook do support ... If you will test this solution, please fill free to share with us your experience.
Regards,
Olivier.