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Article ID: 2841150 - Last Review: August 13, 2013 - Revision: 1.0

Symptoms

Consider the following scenario:
  • You sign in to Outlook Web App (OWA) and then open Exchange Control Panel (ECP) in a Microsoft Exchange Server 2010 environment.
  • You open a large distribution group that contains more than 1,800 recipients, and then you expand the Membership tab.
  • You add or remove a recipient in the members list, and then click Save.
In this scenario, you receive the following error message:
The recipient "MailboxName" is already a member of the group "GroupName".

Cause

This issue occurs because of a logic defect in the ECP code. Specifically, ECP calls only the Update-DistributionGroupMember cmdlet instead of calling the Add-DistributionGroupMember or Remove-DistributionGroupMember cmdlet for large distribution groups.

Resolution

To resolve this issue, install the following update rollup:
2866475  (http://support.microsoft.com/kb/2866475/ ) Description of Update Rollup 2 for Exchange Server 2010 SP3

Status

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

Applies to
  • Microsoft Exchange Server 2010 Service Pack 3, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseinter KB2841150
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