2003 to 2010 migration

2 questions.  
we are changing our domain name along with the migration.
we are using 2 (old and new) domain names for a 2 month transition

for purpuses

users name is john hugh

old domain  hughj@testa.com  (the set up for our users is last name first initial@testa.com
new domain john.hugh@testb.com (we are going to first name (dot) last name@testb.com

is there an easy way to do this or am i going to have to type in a smtp address for every user.
also
should i do this on the old box before i migrate to the 2010 box?

jamesmetcalf74Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

reijerCommented:
you can make a custom recipient policy for example:
%g.%s@maildomain.com
You must be sure active directory info is properly filled in.

For more information see this article: http://support.microsoft.com/kb/822447


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Viral RathodConsultantCommented:
"is there an easy way to do this or am i going to have to type in a smtp address for every user."

Yes ,You create additional policy and apply to all the users

"should i do this on the old box before i migrate to the 2010 box?"

You can do this on old box or after migration on 2010 ,if you create on old box then this will automatically replicate to exchnage 2010

But make sure do not modify the default policy ,Create additional policy and apply to all the users

Hope this helps.
Suliman Abu KharroubIT Consultant Commented:
Also, you have to create a new accepted domain testb.com in order to be able to receive emails for that domain. (authoritative relay)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.