Cannot Use Word 2003 As Editor In Outlook When ACT! Addin Is Installed

I recently had a customer who uses Office 2003 and ACT!.  He had the ACT! Outlook addin installed and would get an error that would popup behind the email saying:

ACT!
Word cannot write to file.

If you stopped Outlook from using Word as the editor for emails, he could send emails fine but the Outlook 2003 email editor does not include spell check for HTML, only plain text.  After researching, I found if you added the user as a local administrator (pretty much all our supported users are local admins so it was unusual he was not) you could set Word back as the editor in Outlook and the errors stopped.