It will look transparent as mentioned in the above post. If you install OWA extensions the users using OWA will also be able to retrieve archive emails.
Enterprise Vault keeps the same structure as you normally would have it, the only exception is if you decide to import PST files (a very nice feature) you can create a folder in Outlook specifically for the PST files. The process is either server or client driven and ensures that the users' pst files are not left on users' PCs.
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