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:

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.