automating email address creation exchange 2010

im ungrading from exchange 2003 to exchange 2010.  i dont have the server yet so this is information gathering only.

i have 125 current users with a domain name we are retiring...
i need to move over the 125 mailboxes to the 2010 box and then add about 125 more.

for 2 months people will have dual addresses...
but i want the default email address to be the new domain name.

is there a away to automate this or am i going to have to type all these new email addresses into place.
jamesmetcalf74Asked:
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ThorinOConnect With a Mentor Commented:
You can create or modify your recipient policies to add the 2nd Email address domain to each user.
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BigBadWolf_000Connect With a Mentor Commented:
In Exchange 2010 you can setup the dfault mailbox setting to have multiple email address with one as the default....so you can setup @newdomain.com as default and @oldomain.com...it will add these for every new mailbox created
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