You cannot modify items that are in a virtual vault other than your own
|Article:TECH161743|||||Created: 2011-06-07|||||Updated: 2014-08-14|||||Article URL http://www.symantec.com/docs/TECH161743|
When a user has access to a secondary mailbox and the Virtual Vault for this mailbox is open in the main mailbox, the following error below will occur while trying to create a new folder or move messages to it.
In Virtual Vault, access to archives other than the user's primary mailbox archive is read-only.
If creating new folders in the shared mailbox is a requirement, they will need to be created in the mailbox first and synchronized to the archive so they are visible in Virtual Vault.
Article URL http://www.symantec.com/docs/TECH161743