Setting default retention policy on new exchange mailbox creation

Setting default retention policy on new exchange mailbox creation

How can we apply our default retention policy in exchange on all new mailboxes that are created through ADManager?  I have our template all setup and it works great other than I cannot set the default retention policy on all new mailboxes without manually doing it.  this kind of defeats our purpose.  Can someone give me some help advice.
 
Thanks.

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