This just came across my path and thought I would share.  Apparently there
is an API (commandline) method of retrieving email from a user account.
 This includes deleted email and can be retrieved from the beginning of
time.    I have not played with this but if it works this could save a lot
of money and help with security concerns.

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---------- Forwarded message ----------
Date: Wed, Apr 25, 2012 at 1:43 PM
Subject: Re: email discovery
Cc: Google Apps K12 Technical Forum <[log in to unmask]>

Regardless of having a backup/archive solution Google already keeps
everything starting from account creation (including deleted content).
 Through the audit API you can request an export of it.  Archiving products
just make it far easier to access are analyze.