The UM mailbox policy assigned to the mailbox in the source forest couldn't be mapped...

Description

When trying to move a mailbox to the cloud (New Remote Move Request), you get the following error:
Mailbox 'user' in the source forest is currently enabled for Unified Messaging but it can't be enabled for Unified Messaging in the target forest for the following reason: The UM mailbox policy assigned to the mailbox in the source forest couldn't be mapped to a UM mailbox policy in the target forest. The source forest policy name wasn't found in the SourceForestPolicyNames attribute of any UM mailbox policy in the target forest. Please fix the problem or disable the mailbox for Unified Messaging before you try the operation again.
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.338.0&t=exchgf1&e=ms.exch.err.Ex92C8B1

Exchange Management Shell command attempted:
'5be89946-4fe2-4634-90d2-0db440da135a' | New-MoveRequest -Remote -RemoteHostName 'owa.domain.com' -RemoteCredential 'System.Management.Automation.PSCredential' -TargetDeliveryDomain 'service.domain.com'

Solution

Enable mapping between the UM Mailbox Policy on the cloud and the UM Mailbox Policy on the on-premises Exchange server. Use the following commands:

1. On the cloud's powershell:
Set-UMMailboxPolicy -id "Office365-UM Default Policy" -SourceForestPolicyNames "Whatever Default Policy"

2. On the on-premises server powershell:
Set-UMMailboxPolicy -id "Whatever Default Policy" -SourceForestPolicyNames "Office365-UM Default Policy"


Affected software:

Microsoft Exchange 2010
Microsoft Exchange 2010 SP1
Office 365 RTM




Comments:

Comment #1 from Steven Pearson [Username: Guest] at 11/02/2015 11:45
Many thanks for this, solved the issue nicely :)
Comment #2 from Silvia [Username: Guest] at 15/04/2015 22:49
Hi, I have multiple on premise policies, how do I add both of them as the sourcefrestpolicynames?
Comment #3 from Kobi Shmueli [Username: Kobi_S] at 01/05/2015 06:45
Silvia: You can just run the commands twice with the different policies.


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