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"More than one mailbox has the same e-mail address" error message when you try to manage a mailbox in a tenant organization in an Exchange Server 2010 SP1 Hosting mode environment

SYMPTOMS
Consider the following scenario:
  • You install Microsoft Exchange Server 2010 Service Pack 1 (SP1) in Hosting mode by using the /hosting switch.
  • You create two tenant organizations (organization 1 and organization 2) in the Exchange Server 2010 SP1 environment. 
  • Organization 1 has a mail-enabled user (user A).
  • You create an external contact for user A in organization 2.
  • The administrator of organization 1 tries to manage the mailbox of user A by using the Exchange Control Panel (ECP).
In this scenario, the administrator receives an ECP dialog box that contains the following error message:
More than one mailbox has the same e-mail address. To resolve this issue, contact your administrator.
CAUSE
This issue occurs because the ECP incorrectly looks up the user by using a global scope. Therefore, two objects that have the same Simple Mail Transfer Protocol (SMTP) address are found.
RESOLUTION
To resolve this issue, install the following update rollup:
2661854 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
For more information about multi-tenant Exchange deployments, visit the following Microsoft website:For more information about the Hosting mode, visit the following Microsoft website:For more information about how to create a tenant organization, visit the following Microsoft website:For more information about the New-MailContact cmdlet, visit the following Microsoft website:
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Article ID: 2660178 - Last Review: 04/16/2012 17:12:00 - Revision: 1.0

Microsoft Exchange Server 2010 Service Pack 2

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