PowerShell Awesomeness!!

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Here is how to get the details of all mailboxes in Exchange 2013 and then assign it to the new App of Enterprise Vault 10.0.4 in a particular OU:

Get-ADUser -SearchBase "OU=My Users,DC=domain,DC=local" -SearchScope Subtree -Filter {proxyaddresses -like "smtp:*"} | ForEach-Object {$mbx = Get-Mailbox $_.SamAccountName; New-App -mailbox $mbx.LegacyExchangeDN -Url ("https://vault.domain.local/EnterpriseVault/OfficeMailAppManifest.aspx?LegacyMbxDn=" + $mbx.LegacyExchangeDN + "&BaseURL=https://vault.domain.com/EnterpriseVault")}

Don't forget the change the -SearchBase, -Url parameters.

All the users in the OU with mailbox enabled will get the new Enterprise Vault Web Application!