We created a .reg file that exported the registry key for the OVEnabled key set to 0. This overrides the policy disables the Offline Vault.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\KVS\Enterprise Vault\Client]
"OVenabled"=dword:00000000
Then in our userlogon.cmd file we put the following lines in:
rem import the Enterprise Vault Offline Vault disable registry key
regedit /s n:\EV-OV-disable.reg
This will import the registry key for any user who logs into the Citrix server. That's it.