How to stop Smart Upgrade Pop Up window

Does anyone know how to stop the “Upgrade Mail File Design” window from poping up for users. The update documents are disabled and I have tried removing the MailSetup= and mailUpgradefolder= entries from the few users having the problem ini file. Any help or suggestoins would be greatly appriciated as I cannot seem to find any information on this subject. Thanks in advance.

Subject: How to stop Smart Upgrade Pop Up window

This isn’t smartupgrade; it’s a desktop policy. Edit the desktop settings doc (you can, for example, set it so the folders are upgraded without a prompt first) or change the users’ policy assignment in their person docs.

Subject: RE: How to stop Smart Upgrade Pop Up window

thank you for responding but we are not using any desktop policies. Any other ideas?