How do I configure the default short name in exchange 2010?

Hello,

I'm configuring an Exchange 2010 server.  I have the proper email address setup so that when a mailbox is created for an existing active directory user the email address is automatically formatted the way we want. firstname.lastname@company.com.

Unfortunetly when I create the mail boxes the default short name is firstnamelastname.  I would like the default short name to be firstname.lastname.

Is there a way to do this? I want to create 150 accounts all at once.

Thanks.
ITguy23Asked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
When you create or edit the policy.    You need to have %g.%s    Try that then apply this should work
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ITguy23Author Commented:
Where do I create the policy? I have that in my email policy to create the proper email address is there a policy for short name?
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Exchange Management Console -->  Org Config -->  Hub Transport -->  Email Address Policy...create new or edit...I believe in this wizard when you get the Email Addresses the second choice down should be firstname.lastname    
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