Migrating Linked Mailbox from Resource Forest to Account Forest

Hello,

at this moment we are outsourcing our mail server to another company and have this infrastructure:

  • Our companies domain A, where are all users accounts;
  • Domain B where are Exchange Server 2013 servers with Linked mailboxes;
  • There are trust between Domain A and Domain B;
  • Users from domain A connecting to linked mailboxes in domain B and have mail addresses "user@domainA";

Now we would like to install our own Exchange server in our domain A and migrate all mailboxes from Domain B. So it would be cross forest Exchange 2013 -> Exchange 2013 Linked mailbox migration. 

Does there are any document, where we could find information about similar cases? Could someone help me with steps what to do, to achieve this goal?

Regards,
Nerijus

Nerijus

August 18th, 2015 7:39am

Hi

Please try the following steps in Exchange 2013 of account forest domainA:
$Local = Get-Credential   (domainA)
$Remote = Get-Credential  (domainB)

Prepare-MoveRequest.ps1 -Identity user@domainA.com -RemoteForestDomainController DC001.domainB.com -RemoteForestCredential $RemoteCredentials -LocalForestDomainController DC001.domainA.com -LocalForestCredential $LocalCredentials -UseLocalObject

New-MoveRequest -Identity "user@domainA.com" -Remote -TargetDatabase "domainB Mailbox Database Name" -RemoteHostName 'CAS01.domainB.com' -RemoteCredential $Remote -TargetDeliveryDomain "domainA.com"

Regards,

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August 18th, 2015 11:16pm

Your another option would be to export all the required mailboxes into PST and import them into desired location wherever you want to move.

You might get help using this application (http://www.exchangemailboxtopst.org/) that seems to be a suitable choice in order to get this job done in more easier way.

August 19th, 2015 3:17am

Thank You for answer. But I have few more questions, before new server installation and migration.

Do I need to convert Linked mailbox (in domain B) to regular mailbox before migration? Does new Exchange server in Domain A will recognize that in this domain there are user accounts with linked mailboxes in other domain (domain B)?

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August 19th, 2015 4:48am

Hi,

Based on my knowledge, it is not necessary to convert the linked mailbox to regular mailbox before the mailbox migration.

Generally, the Prepare-MoveRequest.ps1 is used to create mail-enabled user in the target forest. However, in your scenario, the target forest is the account forest for all mailboxes. The user accounts have been existing in the account forest.

Therefore, the -UseLocalObject parameter is used with the PrepareMoveRequest.ps1 so that any already existing mail enabled contact created earlier in the forest is merged into the MEU created by the PrepareMoveRequest.ps1 script. It would match the user account in account forest with the Prepare-MoveRequest.ps1 cmdlet.

Regards,

August 24th, 2015 5:03am

Hi Winnie

I have similar scenario but the Exchange versions running in Exchange Resource forest are either Exchange 2010 SP3 or Exchange 2007 SP3.

Will above solution will work for migration from Exchange 2010/2007 too ?

Thanks

Regards

Parveen Khanna

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August 31st, 2015 1:59am

Dear Winnie,

Thank You for help, but I still have few questions, If You can help. After Exchange servers installation in Account forest, how to configure Exchange (DNS, transport rules or etc.?) before migration? When I need to change DNS MX records? How Exchange will work in migration process, when few users will be in one server and few in other Exchange server? If someone will send email to migrated user, who is in Account forest Exchange server, but MX records shows Resource forest IP, do that person will get "Can not delivery message.."?

Can You help me with step what should I do before migration, to prevent messages disappear errors?

Regards,
Nerijus

September 14th, 2015 9:44am

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