Move some email accounts to a new exchange server

Posted on 2016-09-17
Last Modified: 2016-09-17
Here is our current setup. We have an Exchange 2010 server receiving email for a bunch of different domains. We just got a new server with Exchange 2016 and moved everything to this new server.

The plan is to decommission the old Exchange 2010 server and then setup it up as a new exchange server completely separate from the 2016 Exchange server. We then want to move just one domain from the 2016 Exchange server to this "new" Exchange 2010 server.

Is there an easy way to do this ?
Question by:WiddleAvi
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Expert Comment

by:Schnell Solutions
ID: 41803373
That sounds cool.

It means that you are fully operating from Exch 2016 because everything was moved there (connectors configuration, system mailboxes, system functions, mailboxes, services, etc). And now you will uninstall your Exch 2010 (remove DBs, etc).

At this point your only server is the new Exch 2016. Then, the next step is to prepare a new Exchange 2010 server... and here the questions...

Is it going to be 'completely separated' ? If this is the case, we are talking about a different Exchange Organization, therefore, a different Exchange forest (and domain).

If the answer is yes... You will have a complete isolation there, definitively you can move your new domain there. You can configure your new exchange server within that server, then you create the users in the new domain (One example is using Active Directory Migration Tool between one forest to another), later you move the data from one exchange organization to another (There are some exchange commands that allow such movement and finally configure your separate domain for that server alone. Here enter many other questions, like if you are going to separate the way that the emails come from the Internet, the public IP, etc.

If the answer is no... It means that you will install a new Exch 2016, but it is going to be the same organization and active directory domain. And in this case you just need to use your mailboxes that corresponds to that domain that you want to separate to the new server. And depending how your emails enter to your network you can apply configurations in such a way that the emails for that domain enters there.

We can give you more details after you gave us more information about the final objectives for your plan.

Author Comment

ID: 41803382
You are correct. We are completely working off the new 2016 server right now but I have not decommissioned the old server. That will happen in the next week.

And then the'new' 2010 server will be completely separate. It will be a different domain, with a separate public IP etc.

We just want to take one domain that we receive email for on the current 2016 server and have that moved the the 'new' 2010 server and then be 2 different servers that have nothing to do with each other.
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Accepted Solution

Schnell Solutions earned 500 total points
ID: 41803386

In that way you can configure your new and separate Exchange environment independently. After everything is ready (Receive connectors, Digital certificates, virtual directories, etc). You can proceed to move your users mailboxes from one forest to another.

You can follow this process which is designed for Exch2013, but it is the same for 2016.
(Notice that there two subarticles under it, that specify how to configure the requirements previous to execute this command. i.e. Create trust relationship, DNS resolution between forests, account permissions, etc).

It consists on executing the command New-MoveRequest specifying credentials from both environments and in that way creating the new mailboxes at the destination environment while moving the data from the original one.

After your data has been transferred you need to eliminate your accepted domain from the current Exchange 2016 server, and change your MX records to point to the IP address of the one.
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Author Comment

ID: 41803389
So 2 questions.
1. The current server is Exchange 2016 and we will be moving the mailboxes back to an Exchange 2010 server. Is that an issue ?
2. Unrelated but the directions I have for decomissioning the current 2010 server is the uninstall exchange and then dcpromo and remove from the domain. Can I skip uninstalling exchange and just demote the server etc ?
LVL 14

Expert Comment

by:Schnell Solutions
ID: 41803400
1. Owwww. I tought that you were going to install a new exchange server 2016. But yes, you can make the movement to Exchange 2010. The webservices that complete this process using the script that is in the article (Prepare-MoveRequest) is compatible with Exchange 2010 as well.

Where I would have some doubts it would be with Exchange 2007, as far as you can make it with 2013 but 2016 does not support it. But to not worry, Exch 2007 is not your case. It works for Exch 2010.

2. Do not skip uninstalling Exchange because of many reasons:
- It will eliminate all the configurations in AD related or connected to that server.
- It will alert you before allowing to uninstall it if there is any configuration still associated with your Exchange 2010 server.
- It will avoid that orphan links stay in your environment. They could bring many issues, are not very easy to detect and in the long term could mean more work for you that the natural process of uninstalling it.
- It is the best practice :)

Then after your exchange 2010 is uninstalled, you can demote it as well. By the way... it is technically possible, but not recommended to combine Exchange and AD. There are some recovery scenarios that they can become harder to resolve with that configuration. For instance, if your server fails and you need to make a recover of Exchange then you will have a dilemma. You cannot recover exchange without having AD as far as it was there, but anyway for recovering AD you will need to reset the AD object, that might brake the best way of completing your restore. If you can... better separate these roles for the next time.

Author Closing Comment

ID: 41803411
This is exactly what I was looking for. Thank you for all your help

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