Outlook add-in Vodafone Text Centre not loading for some users

We have a terminal server with Windows 2003 32bit and Outlook 2003 (sp3).  We have had an add-in for Outlook installed called Vodafone Text Centre which allows users send texts from outlook.

It was working fine for a while, but now we are finding that every new user will add, cannot access this feature (the button doe not appear in Outlook).  The add-in has a tick by it in tools->options->other->advanced and I also checked to see if it is disabled.  The users that had it working before we got this problem are still working now.

I have tried reinstalling the add-on without effect, I know a solution might be to completely remove office and reinstall, but because it is a terminal server used by around 60 users, we don't want to do this.
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GiotechConnect With a Mentor Author Commented:
I ended up renaming another account of a user that left the company.
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