Before moving a mailbox database to a new server, the database needs to be in a Clean Shutdown state. If the database is in a Clean Shutdown state, proceed to Step 2. Otherwise, perform the following soft recovery step:

Note:
When you perform a soft recovery, any uncommitted log files are committed to the database. If you do not have all of the required log files, you will not be able to complete the soft recovery process. Proceed to step 2.

• To commit all uncommitted log files to the database, from a command prompt, run the following command:
  
  

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  ESEUTIL /R <Enn>

  Note:
  <Enn> specifies the log file prefix for the storage group that contains the database into which you intend to replay the log files. The log file prefix specified by <Enn> is a required parameter for Eseutil /r. You can run the following Exchange Management Shell command to determine the log file prefix of a storage group:

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  Get-StorageGroup <Server_Name>\<StorageGroup_Name> | fl LogFilePrefix

Before you can mount the database, you must create the database on the new server. Select the storage group that will contain the database, and then create the database using the following Exchange Management Shell command:

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New-MailboxDatabase -StorageGroup <Server_Name>\<StorageGroup_Name> -Name <Database Name>

Note:
To create a new storage group, see How to Create a New Storage Group.

Set the This database can be over written by restore attribute by running the following Exchange Management Shell command:

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Set-MailboxDatabase <Database Name> -AllowFileRestore:$true

Move the database files (.edb files, log files, and Exchange Search catalog) to the appropriate location. The database files need to be present and in the correct location on the new server.

Mount the database using the following Exchange Management Shell command:

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Mount-Database <Database Name>

After the database is mounted, modify the user account settings with the Move-Mailbox -ConfigurationOnly command so that the account points to the mailbox on the new mailbox server. To use the Move-Mailbox cmdlet to move all of the users from the old database to the new database, run the following Exchange Management Shell command:

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Get-Mailbox -Database <SourceDatabase> |where {$_.ObjectClass -NotMatch '(SystemAttendantMailbox|ExOleDbSystemMailbox)'}| Move-Mailbox -ConfigurationOnly -TargetDatabase <TargetDatabase>

Note:
If there was a new mailbox that had no mail or had not been opened, this command would not move the mailbox because it does not exist in the store.