I have a user that we need to move messages from the vault back into his mailbox. On my workstation I have all the quick access toolbar buttons available. On his computer the only one available is the Search Vaults. I tried to add the additional buttons in his Outlook but they are not even listed there to add them to the toolbar. I removed the EV client v9 for Outlook 2010 and reinstalled it but still cannot add the needed buttons.
Sounds like the users mailbox is disabled from EV archiving.
The result of that is that after the next mailbox synchronisation run from EV, the buttons will disappear, and they'll be left with the search button.
Find out what Desktop policy is applied to them
Expand Site ==> Targets ==> Right click on Exchange ==> Display policies assigned to Mailboxes ==> Type the user name and select the Exchange Server name where users mailbox is sitting
make a note of the desktop policy applied to the user
Go to the properties of that desktop policy and click on the Option and verify if you have enabled all the Toolbar's