If you use Offline Vault then you do need to upgrade the Outlook Add-Ins. You can upgrade Enterprise Vault 2007 Outlook Add-Ins before or after you upgrade Enterprise Vault 2007 servers.
The order in which you perform the upgrades affects the way Enterprise Vault handles the change from Offline Vault to Vault Cache, as follows:
Vault Cache is automatically enabled. Users do not see any message and they do not need to take any special action.
Offline Vault automatically enters read-only mode. Users still have access to their existing Offline Vault, but Enterprise Vault no longer updates the contents of the Offline Vault.
When a user opens Outlook, Enterprise Vault displays a message. The message says that the Enterprise Vault administrator has temporarily disabled updates to the user's Offline Vault, and that the user will be notified when updates are re-enabled. The user can choose not to show the message again.
If the value of the Offline Vault advanced setting Show Setup Wizard is Off in the Exchange Desktop policy, the message is not displayed.
When you upgrade the Enterprise Vault servers, Vault Cache is automatically enabled in the Outlook Add-Ins.
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