Exchange 2010 retention policy not preventing deletions - user deleted entire mailbox

Exchange Database is set to keep deleted items for 1 year
retention policy applied to the mailbox is attached
User mailbox was 40GB a few months ago but is now 480MB (mailbox properties) - mostly calendar items.  The user was able to delete everything else.

I am now faced with doing a restore from backup of a 600GB database for each day until I find the day it was deleted.

Looking for tips on finding out how he managed to delete everything and prevent it.

Any tips on recovering the mail (finding out when it was deleted or locating the mailbox size without restoring the db first) would be helpful as well.  Backups were taken using Server Backup 2008 R2.

the multi mailbox search and new-exportrequest failed to return any emails.  The user was terminated yesterday - will start there.

Thanks
  Retention Policy on User Mailbox
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YMartinAsked:
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Jeff GloverSr. Systems AdministratorCommented:
Retention tags say when mailbox items are automatically deleted or moved to archive, not when you can delete them. It is the users mailbox and they can clean it out if they choose. The only way around that is a Litigation hold. If you truly have the mailboxes set to keep deleted items for a year, then you should be able to recover them from the Deleted Items recycle bin.
If you feel you need to use Litigation hold, there is a pretty good description here
http://www.msexchange.org/articles-tutorials/exchange-server-2010/compliance-policies-archiving/exchange-2010-litigation-hold-part1.html
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YMartinAuthor Commented:
Thank you for the article.  It pointed me in the right direction.  I don't need litigation hold but I do need single item recovery which is disabled by default.  

Single Item Recovery will instead of deleting the items move the items to the purges folder which is what I need.

I have now enabled it on all mailboxes and need to make sure new mailboxes are enabled from the start.  
Get-Mailbox | where-object {$_.singleitemrecoveryenabled -eq $false} | set-mailbox -SingleItemRecoveryEnabled $true

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YMartinAuthor Commented:
thanks
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YMartinAuthor Commented:
More information was required in order to solve the problem.
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