You cannot change SMTP addresses for distribution groups by using EAC in an Exchange Server 2013 environment

Symptoms
When you try to add or remove SMTP addresses for distribution groups by using Exchange Admin Center (EAC) in a Microsoft Exchange Server 2013 environment, you receive the following error message:
Conversion from Microsoft.Exchange.Management.ControlPanel.EmailAddressItem to Microsoft.Exchange.Data.ProxyAddress has not been implemented.
Cause
This issue occurs because Windows PowerShell cannot identify the EmailAddressItem type.
Resolution
To resolve this issue, install the following cumulative update: 
2892464 Description of Cumulative Update 3 for Exchange Server 2013

Workaround
To work around this issue, connect Windows PowerShell to the Exchange Online service, and then use the Set-DistributionGroup cmdlet to add or remove SMTP addresses.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about how to use Windows PowerShell in Exchange Online, go to the following Microsoft website:For more information about the Set-DistributionGroup cmdlet, go to the following Microsoft website:
Properties

Article ID: 2902936 - Last Review: 11/25/2013 23:53:00 - Revision: 3.0

Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard

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