Outlook Express users not only won't be able to see the form. They also
won't be able to access any attachments you send with the form. Best bet is
to use Outlook forms only internally and with tightly integrated external
partners.

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> We have created a form for our external customers?
>
> Will Outlook Express users have problems sending the form? What about
> those using versions other than Outlook 2000?