Cannot change a distribution group that contains more than 1,800 members by using ECP in OWA in an Exchange Server 2010 environment

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 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.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

Thank you for your feedback!

Thank you for your feedback! It sounds like it might be helpful to connect you to one of our Office support agents.

×