Connect Exchange 2013 to new AD DC


We have the environment with windows 2012 server which is AD DC and also we have Exchange 2013 server on windows 2012 machine and they are located in the forest called Because of some issues with our AD DC server, we decided to install completely new AD DC server on windows 2012 in a new forest called and we migrated all users and computers from the AD to AD. Now we need to connect our Exchange 2013 which is located in to newly created AD DC in and connect user mailboxes to AD users which were imported from the old AD.

Thank you.
Guntis SAsked:
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Jose Gabriel Ortega CastroCEOCommented:
Since it's a new Infrastructure, you need to deploy it again from start, and then move the pst of each user into the new infrastructure.
I mean Exchange really depends on ADCS, since you already have it connected to the infrastructure (if there's no ADCS ( is orphan, so there's no way to disconnect from to connect it to the new.
The solution is to  deploy it the new ADCS and do the migration, not just the connect-disconnect process

So the process is:
Export all PST of all users in
Deploy Exchange 2013 in the new infrastructure.
Load the PST on the server or just on the outlook to do the migration.
Guntis SAuthor Commented:
maybe I can just backup all user mailboxes and then restore them on a new exchange server which will be in the new domain?
Jose Gabriel Ortega CastroCEOCommented:
The problem is that your Exchange server relies on the Domain controller DNS and specifically in the domain that is already configured, even in the organization name, since those digital signatures won't match it won't be possible to do it as a recovery, for that, you need exact same domain name, same organization name  and same OS versions

Since you changed your ADCS the process is a migration, not just a recovery.
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Guntis SAuthor Commented:
And what if I perform Cross Forest Migration using PrepareMoveRequest.ps1 to migrate all mailboxes to a new Exchange server?
Lee W, MVPTechnology and Business Process AdvisorCommented:
It doesn't sound like you understand Exchange very well - I would suggest you export the mailboxes to PST files and then import them into the new Exchange server.  Better still, work with someone who has experience doing migrations like this so you get it right and don't lose anything and waste time and money struggling with it while your users sit idle or potentially lose data.

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Guntis SAuthor Commented:
Yes it is true I am new to Exchange I will take your advice and will export mailboxes to PST files. Unfortunately, I am on my own here ...
Jose Gabriel Ortega CastroCEOCommented:
This expert suggested creating a Gigs project.
Well, I'd suggest a gig.
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Lee W MVP (https:#a42364175)

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