Enterprise Vault Add-In Pop-Up Message (Outlook Data File Size)

Last night we put in a Group Policy to remove Cached Exchange mode on all school computers and remove the options to create PST/OST files within Outlook 2010.  We are running Enterprise Vault 8 SP5.  This morning we have had two computers receive a pop up window from the Vault Add-in:

"A setting on your computer that controls the size of Outlook data files may affect the operation of the Enterprise Vault Outlook Add-In.

  Contact your Enterprise Vault administrator for details of how ot resolve this issue."

The vault add-in is working after the user clicks on OK to dismiss the message.

I am assuming this is due to the GPO turning off Cached mode and making sure that no OST files can be created but wanted to hear from the experts.