Outlook add-in problems with Word Editor in Citrix

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Hello,

I built a COM add-in for Outlook which is used in a Citrix environment. The
add-in makes use of a custom toolbar on mail items which launches a customer
VB form. The Word email editor is set as the default editor in Outlook,
however, when sending emails which make use of the COM add-in the normal
editor appears. This behavior has not appeared on a standard XP desktop
configuration, only when running Outlook in a Citrix session.

Has anyone had issues such as this when running COM add-ins in Citrix?

Any help would be greatly appreciated.