Outlook 2003, unable to accept meeting invites

[Lightngsvt]

I have a system on my network that no matter what we try cannot accept meeting invites. I have tried numerous fixes that all work temporarily (a few hours - a few days) but always reverts back to the same issue. The system is a Lenovo T60 running XP Pro SP2 on a dmonain and connecting to and Exchange 2003 server. I have tried

running the switched /cleanfreebusy, /cleanreminders, /reset folders
reinstalling Outlook 2003
creating a new mail prfile

Other than creating a new user profile Im not sure what to do at this point? All other office apps are working fine.

[ThePoor]

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[pam123]

This is a work around, not really a solution.
See if it helps : http://groups.google.com/group/microsoft.public.outlook.calendaring/browse_thread/thread/5f25f4467228c8db/8969198906cb622f%238969198906cb622f