Active Directory Migrations: User ADMT and Mailbox Move

I’m not going to go thru the screenshots of how to ADMT a user over. That’s documented well enough elsewhere (i.e. HERE).

All I’ll really say about that is that you NEVER want to migrate Exchange attributes of a user. Never, ever, ever. The process for migrating a user and a mailbox is simple enough:

  • Run prepare-moverequest.ps1 for each mailbox that needs to be created. It creates an MEU (mail enabled user) on the target side with all the exchange attributes you need. Essentially a fancy contact
  • ADMT the user (see above). Exclude: homeMDB, homeMTA, mailnickname, all the msExch*, all the msRTCSIP, proxyaddresses, targetaddress
  • Perform a move mailbox (see below). The move mailbox converts the source account into a MEU on the source domain. This is needed for mailflow.

## Get date, set our transcript file, etc.

$date=get-date -format "yyyyMMdd"
$Tranoutput="d:\migration\Outputs\" + $date + "Mailboxmove.txt"
start-transcript -path $Tranoutput -append

##call include file
## This ensures that the variables are loaded, altho if you followed the previous article they already should be
. .\params.ps1

## Create Remote Powershell session to the Exchange 2010 server
## Greate for making sure all your command can be run from one place
$ExchSession=New-PSSession -ConfigurationName Microsoft.Exchange -connectionuri $ExchURI -credential $LocalCredentials
import-pssession $ExchSession|out-null
## Import the include file
$import=import-csv $ImportFile
## Do a move request for each mailbox using all of our variables
## Targetdeliverydomain is important to ensure mailflow. It should be set to a 3rd SMTP domain that is only being used by the 2010 environment
## This then gets set on the MEU in the source side

foreach ($item in $import){
 New-MoveRequest -Identity $item.smtp -domaincontroller $TargetDC -RemoteLegacy -RemoteGlobalCatalog $SourceDC -RemoteCredential $RemoteCredentials -TargetDeliveryDomain $TargetDeliveryDomain -baditemlimit 50
## clean up after yourself and close your remote powershell session
remove-pssession $ExchSession


The move mailbox ends up being the easiest part of this whole process. You can run powershell commands to check the status of the move request or just go into the Exchange console and check it there.


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