Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

  1. Home
  2. "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

"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

View products that this article applies to.

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.

↑ Back to the top

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.

↑ Back to the top

Resolution

To resolve this issue, install the following update rollup:
2661854 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2

↑ Back to the top

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

↑ Back to the top

More Information

For more information about multi-tenant Exchange deployments, visit the following Microsoft website:
General information about multi-tenant Exchange deployments
For more information about the Hosting mode, visit the following Microsoft website:
General information about the Hosting mode
For more information about how to create a tenant organization, visit the following Microsoft website:
How to create a tenant organization
For more information about the New-MailContact cmdlet, visit the following Microsoft website:
General information about the New-MailContact cmdlet

↑ Back to the top

Keywords: kbqfe, kbfix, kbexpertiseinter, kbsurveynew, kb

↑ Back to the top

Article Info
Article ID : 2660178
Revision : 1
Created on : 1/7/2017
Published on : 4/16/2012
Exists online : False
Views : 190