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"The term 'New-Mailbox' is not recognized" error message when you create a mailbox in an Exchange Server 2010 environment

Symptoms
Assume that a server is configured to use role-based access control (RBAC) or Active Directory split permissions in a Microsoft Exchange Server 2010 environment. You try to create a new mailbox by using Exchange Management Console (EMC) or by running the New-Mailbox cmdlet in Exchange Management Shell (EMS). However, the operation fails, and, you receive the following error message: 
Error:
The term 'New-Mailbox' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

Note
 When this issue occurs, you can still mail-enable an existing user account that was created in Active Directory.

Cause
This issue occurs because split permissions separate management tasks between Exchange administrators and Active Directory administrators.

Note By default, Exchange 2010 uses the Exchange shared permissions model, which enables Exchange administrators to create user objects in Active Directory. In some organizations, this behavior is unacceptable. Therefore Exchange 2010 introduced the split permissions model. Split permissions can be configured by using RBAC (recommended) or through Active Directory (configured during the Exchange setup process).

Resolution
To resolve this issue, use EMS to change the RBAC split permissions. Or, run the Setup.com command at a command prompt to change the Active Directory split permissions to the default Exchange 2010 shared permissions.
For more information about how to change from RBAC split permissions or Active Directory split permissions to shared permissions, go to the following Microsoft website:
Note You cannot use EMC to change the RBAC split permissions or the Active Directory split permissions to shared permissions.

More information
For more information about split permissions, go to the following Microsoft website:
Properties

Article ID: 2795751 - Last Review: 12/25/2012 09:32:00 - Revision: 1.0

Microsoft Exchange Server 2010 Service Pack 1, Microsoft Exchange Server 2010 Service Pack 2, Microsoft Exchange Server 2010 Enterprise, Microsoft Exchange Server 2010 Standard

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