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Microsoft KB Archive/926094

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You do not receive a warning message when you specify a duplicate e-mail address in the Active Directory Users and Computers MMC snap-in on a Windows Server 2003-based computer that has Exchange System Management Tools installed

Article ID: 926094

Article Last Modified on 10/11/2007



APPLIES TO

  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition
  • Microsoft Windows Server 2003, Web Edition
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems



SYMPTOMS

Consider the following scenario. You install Microsoft Exchange System Management Tools for Microsoft Exchange Server 2003 on a Microsoft Windows Server 2003-based computer. In the Active Directory Users and Computers Microsoft Management Console (MMC) snap-in, you specify an e-mail address for an object. However, the e-mail address that you specify is already used by another object. In this scenario, you do not receive a warning message when you specify this duplicate e-mail address.

Additionally, this problem occurs when you use the Find feature in the Active Directory Users and Computers MMC snap-in to locate the object for which you specify the e-mail address.

CAUSE

This problem occurs because the Active Directory Users and Computers MMC snap-in does not generate a notification when you specify the e-mail address for an object in Active Directory that you select in the Find dialog box. Therefore, Exchange Extension (Maildsmx.dll) does not check for uniqueness even though the new e-mail address is a duplicate.

WORKAROUND

To work around this problem, use the Active Directory Find feature to make sure that the e-mail address that you specify is not used by any other object. Do this when you want to change the e-mail address for an object.

MORE INFORMATION

The expected warning message is raised by Maildsmx.dll to the Active Directory Users and Computers MMC snap-in. Maildsmx.dll generates the warning message only when the management console notifies Maildsmx.dll that an e-mail address has changed. When Maildsmx.dll is notified, it checks the new e-mail address for uniqueness in Active Directory. If Maildsmx.dll detects a duplicate e-mail address, Maildsmx.dll raises the warning message.

When you create a duplicate e-mail address for an object, the following warning message is supposed to appear:

This e-mail address already exists in this organization.
ID no: c10312e7
Microsoft Active Directory - Exchange Extension

This warning message does not prevent you from creating the duplicate e-mail address. However, you can take appropriate actions when you receive this warning message.

Additionally, the following problems may occur if you continue to use the duplicate e-mail address for the object in Active Directory:

  • E-mail messages that you send cannot be delivered to the objects that share this e-mail address. In this scenario, the you receives the following non-delivery report (NDR):

    A configuration error in the recipient's e-mail system prevented delivery of this message. Two recipients are configured with the same e-mail address. Contact your administrator.

  • Every time that you send an e-mail message to one of the objects that use this e-mail address, an event that resembles the following is logged in the Application log:

    Event ID: 9514
    Event Type: Warning
    Event Source: MSExchangeIS
    Description:
    Two objects in the Directory have the same proxy
    /DC=COM/DC=[domain]/CN=[Container1]/CN=[Object1] and
    /DC=COM/DC=[domain]/CN=[Containe2]/CN=[Object2]

  • If you are a mailbox-enabled user who has a duplicate e-mail address, you receive the following error message when you try to log on to the mailbox in Microsoft Outlook Web Access (OWA):


    HTTP 500 - Internal server error

  • An event that resembles the following is logged in the Application log:


    Event Type: Error
    Event Source: MSExchangeIS
    Event Category: General
    Event ID: 9549
    Description:
    An ambiguous SMTP proxy user1@domain.com was found on 0x2 mailboxes in the DS. The store cannot map this SMTP proxy to a unique Mailbox GUID.


STATUS

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

Keywords: kbtshoot kbprb KB926094