Exchange 2010 Domain Name change in a multitenant (hosted) environment

Question

Is there a way to change a domain name from one of our domains?
We have exchange 2010 SP1 in hosted mode so we have several domains we deliver to our customers.
However, now 1 of our customers would like to change their domain name.
For example abc.com should become 123.com
To make it even a litle bit more complicated, in the first instance they want to add the 123.com domain so they receive emails on both domains. After a month they want to delete the old domain ( abc.com ) and keep on receiving emails on the new domain
( 123.com ).
Please keep in mind that the other domain that we also provide must not be affected.
Any help would be grate as I am stuck on this one.
I simply don't know the correct powershell commands.

Answer 1

Hi Peter,
I read the email and as I was writing a reply I thought by myself, why not share it with the rest.
I am sure other people need this to so I copy paste it in here :-):
===================================
Hi Peter,
If this helps you out, the only thing I want back is for you to help 3 others and share this message so they help out other people aswell. :-D peace
Unfortunately there is no way according to microsoft ( as far as I am aware ) to make a domain change in the hosted edition and for this reason I had to figure it all out myself.
I am no scripter so I didn't build a tool for it, sorry.
I will send you all the information you need.
1- add the accepted domain: New-AcceptedDomain -Name NameOfOrg -Organization ForWhichDomainWillThisBeTheAcceptedDomain -DomainName NewDomain.Eu -DomainType Authoritative
2- to create an alias ( tenant admin )
Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -EmailAddresses @{add=$_.smtp1}}
The text file has to be in the following format:
alias,smtp1
firstalias,newemailaddress
secondalias,newemailaddress
etc.
3- Make the new alias the primarysmtpaddress ( main exchange admin ):
Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -primarysmtpaddress $_.smtp1 -emailaddresspolicyenabled $false}
The txt file should be in the following format:
alias,smtp1
domain\alias1,newemailaddress
domain\alias2,newemailaddress
etc.
4- Rename the alias ( tenant admin ):
Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -alias $_.smtp1}
The txt file should be in the following format:
alias,smtp1
alias1,newalias1
alias2,newalias2
etc.
5- Change UserPrincipalName (main exchange admin ). This is the username to sign in to OWA
Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -userprincipalname $_.smtp1}
The txt file should be in the following format:
alias,smtp1
domain\alias1,newemailaddress
domain\alias2,newemailaddress
etc.
6-  Change displayname (tenant admin ):
Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -displayname $_.smtp1}
The txt file should be in the following format:
alias,smtp1
alias1,displayname
After a while you might to remove the previous email address ( i waited for this for 3 months! 1 month is way to short for people to communicate it, trust me.. ):
7- Import-CSV name-of-textfile.txt | foreach-object {Set-Mailbox $_.alias -EmailAddresses @{remove=$_.smtp1}}
The txt file should be in the following format:
alias,smtp1
alias1,OldEmailAddress1
alias2,OldEmailAddress2
Andre
Peace