Cross Forest Migration Guide – Exchange 2010 to Exchange 2010 This Migration Guide will help you to migrate mailboxes across forest It’s always people go confused when source and target forests are Exchange 2010, I have tried to explain as detailed a possible and covered one method Where “Running .\PrepareMoveRequest.ps1 first and then using ADMT to migrate the Sid History” of the users Please share your feedback in comments, So that I can update the guide frequently So let’s go ahead Step 1: Have Trust in place across forests, in my Situation I created two way Transitive Trust where I won’t get into any permission constraints Good to know: We can limit permissions by going for different type of trusts See - How to Create Two way Transitive Trust – Windows Server 2008 R2 Step 2: You need Active Directory Migration Tool to Get your User accounts migrated without any hassle, You can install it in either of the forests but , Have installed in the target forest , where I will be doing most of my work See - How to install ADMT 3.2 in Windows Server 2008 R2
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Cross Forest Migration Guide – Exchange 2010 to Exchange 2010
This Migration Guide will help you to migrate mailboxes across forest
It’s always people go confused when source and target forests are Exchange 2010, I have tried to explain as detailed a possible and covered one method
Where “Running .\PrepareMoveRequest.ps1 first and then using ADMT to migrate the Sid History” of the users
Please share your feedback in comments, So that I can update the guide frequently
So let’s go ahead
Step 1:
Have Trust in place across forests, in my Situation I created two way Transitive Trust where I won’t get into any permission constraints
Good to know: We can limit permissions by going for different type of trusts
See -
How to Create Two way Transitive Trust – Windows Server 2008 R2
Step 2:
You need Active Directory Migration Tool to Get your User accounts migrated without any hassle, You can install it in either of the forests but , Have installed in the target forest , where I will be doing most of my work
If you are planning to migrate the User account with SID – Which is recommended – where users will still have access to their old forest where they will be recognized like
Access file shares and permission groups etc. So I would always recommend to get your SID along with the Users
If you are planning to Migrate Users with Password that doesn’t happen by default, you have to Configure “Password Export Server” in the source domain
See -
How to Migrate Users Across forest (Cross Forest) using ADMT 3.2 with Sid and Passwords
Step 4:
Enable MRS Proxy on the Source Client Access Server which is going to facilitate the Remote move from the Source Forest,
I have described Enabling MRS proxy where version is Exchange 2010 Sp1 or later because enabling MRS Proxy in RTM version differs
See-
How to Enable MRS Proxy and Increase timeout In Exchange 2010
Am Running this on the Target Forest – $localCredentials Means the TargetForestCredentials
SourceForest – careExchange.in
TargetForest – TargetExchange.in
Please don’t forget to Type the DomainName\UserName
$localCredentials = Get-Credential
$RemoteCredentials = Get-Credential
Means my Source Forest
Note: After Storing your Credentials – Do not Close Shell – You got to run the Future Command in the Same Power Shell Session
Step 9:
Now Preparing a Move Request
Browse your Exchange Management Shell into Scripts Folder in your Target Forest , Which will be in Exchange installation Location
.\Prepare-MoveRequest.Ps1 -Identity "EmailAddress" -RemoteForestDomainController "FQDN of Source DC" -RemoteForestCredential $RemoteCredentials -LocalForestDomainController "FQDN of Target Forest DC" -LocalForestCredential $LocalCredentials -TargetMailUserOU "Distinguished name of OU in TargetForest" –UseLocalObject -Verbose
Using –Verbose in the end of the Command
You can clearly see what are the Attributes its getting touched
Mail,Displayname,Proxyaddress etc..
Now you can See a Disabled account which has been Created on the Specified OU
Step 10:
Now use ADMT to migrate the SID and Enable the Target Account which is “Mailbox1” in my Scenario
See-
How to Migrate Users Across forest (Cross Forest) using ADMT 3.2 with Sid and Passwords
Now you can find the SID history of the account , Where you can confirm that you did things correctly
Or just login to a client machine and change the password at first logon
Great!! You able to login in Target Forest Success fully!!
Step 12:
To Move the Users in Bulk
See-
Cross forest Move Mailbox in Bulk – Exchange2010 to Exchange 2010
Step 13:
If you doesn’t want to share free/busy information as of now. Skip it
If you want to share Free/busy information across forests. If source domain is always going to exist even after migration. I would recommend creating Federation Trust which is free of service from Microsoft to share free busy information.
If you don’t want to go for Federation and still you can share free busy using below method
See -
How to Configure Cross forest Availability Service (Free/Busy,Autodiscover) – Exchange 2010 to Exchange 2010
Happy Cross forest Migration!!
Hope I covered everything and made it as much simpler as I can!!