What would be involved to change an exch 2007 email domain or address

We need to change our email address for all user on Exch 2007 from (this is an example) 12345.com to abcde.com
What steps would be needed to make this change and would there be downtime involved for the users to make the change?
I know that I would have to have the certificate redone but just want to make sure on all of the other steps needed.
I think I would just have to go into Recp config and make he change there on the recpt policy.
So basically create a new accepted domain, then create a new email address policy?
If this is correct, please let me know if I am missing anything.
Thanks
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vmichAsked:
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Peter HutchisonSenior Network Systems SpecialistCommented:
Steps:
Add the new domain to the Accepted Domains list.
Change the Email Address Policies

Changing the policies will automatically update all mailboxes, mail-users and mail-enabled public folders that have the
'Automatically update e-mail addresses based on e-mail address policy' enabled.
If there are additional email addresses or recipients with this NOT set, then they will need changing manually.

Update DNS with MX records for the new domain.

Note, any mail send from external addresses send to the old domain will fail as an NDR, to prevent that you could try
setting up a transport rule to change incoming mail sent to 12345.com to be re-written to the new abcde.com address. You will need to have Edge Transport servers to do this.
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vmichAuthor Commented:
I was wondering about the email going to the old domain and still am wondering what I need to do with that because they do not have a edge server?
So how would I handle to email being sent to the old email domain?
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HornAlumCommented:
if he added the "accepted domain", and made the new domain the "primary" domain in the email address policy, the server should still accept emails to the old domain. As long as he doesn't remove the other domain in the policy list.
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vmichAuthor Commented:
Ok that's what I kind of thought but just was not 100% sure..
So if I don't remove the old domain from the address policy, I should be ok with emails getting to the users via the old domain also?
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HornAlumCommented:
you should be ok, yes.

I'm using Exch 2010, but the principle is the same ... you define all of your accepted domains. Every domain needs a public MX record that points to your Exchange server. You just have one "default" email domain.
You can define your email address policy to make the new domain be the primary domain (and as Peter said, if the users have the auto setting on, it should automatically update), but you can leave the old domain in there, so every user gets two email addresses.

We had this set up on Exch 2003 too and it worked fine. we had like 6-7 different domains that could all get email.
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vmichAuthor Commented:
Added new domain
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