There are two major causes of code in an Outlook form not running -- 1)
security settings in Outlook 2003 and 2) the broader form script security
features introduced with the Outlook Email Security Update.

#1: Outlook 2003 includes a new setting -- turned off by default -- to allow
forms in shared mailboxes to run script. You can change the setting by
choosing Tools | Options | Other | Advanced Options and checking the box for
Allow script in shared folders. See
http://www.outlookcode.com/d/ol2003problems.htm#mailboxscript for more
information on this setting and a comparable one (on by default for public
folders).

#2: If the form runs code when you use Run This Form in design mode, but
doesn't run code after you have sent or saved an item using the form, you
probably have done something to "one-off" the form. Outlook 2003, Outlook
2002, Outlook 2000 SP2 and Outlook 2000 or 98 with the Email Security Update
will not run code on one-off forms; see
http://www.outlookcode.com/d/secforms.htm for more information on this
issue.

To ensure that a form does not one-off:

-- Make sure the "Send form definition with item" box on the (Properties)
tab of the form is *not* checked. [1]

-- For in-house corporate use with Exchange Server, publish the form to the
Organization Forms library or a public folder's forms library, as
appropriate for your application.

-- For collaboration via the Internet, publish your form to your Personal
Forms library. Save it as an .oft file and send it to other people who need
to use it with instructions to publish it with the same form name that you
used.

Many other things can cause one-off forms. If the above steps don't work on
a new item created with your form, see
http://www.slipstick.com/dev/formpub.htm#oneoff for other possible causes.

[1] Whenever you publish a message form, Outlook will suggest that you may
want to check the "Send form definition with item" box to ensure that the
recipient will have the form, especially if you're sending to someone via
the Internet. In the current Outlook security environment, this suggestion
is obsolete. Ignore it unless your form has no code behind it.