3rd party Outlook add-ins may cause Virtual Vault to download full items from the Enterprise Vault (EV) server even if the VVStubOnlyModuleList policy is correctly configured
In some cases the EV Outlook add-in would not detect the 3rd party add-in properly.
This issue has been addressed as part of the following release:
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 10.0.1 - Release Details