See figure 1 below, a pop-up message is displayed in Microsoft Outlook when attempting a "Store in Vault" function:
Figure. 1
See figure 2 below, apop-up message is displayed in Microsoft Outlook when attempting a "Restore from Vault" function:
Figure. 2
The mailbox in question was migrated from a Microsoft Exchange server previously targeted for Enterprise Vault (EV) archiving.
See Article: 000032119 on "How to move archive-enabled mailboxes from one Exchange server to another." Part lll and Part lV of 000032119 are pertininant to said solution, however review the article for further detail on "How to move archive-enabled mailboxes from one Exchange server to another" in case any steps were overlooked.