ExpandGroup method returns no results for Dynamic Distribution Group in Exchange 2010

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Strange but TRUE! This work in Exchange 2007 but does not in Exchange 2010. Below is the request and response that I get from a Exchange 2010 server for the ExpandGroup Exchange Web Services call:

Request:

 <?xml version="1.0" encoding="utf-8"?>
 <soap:Envelope xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:m="https://schemas.microsoft.com/exchange/services/2006/messages" 
                            xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types" xmlns:soap="https://schemas.xmlsoap.org/soap/envelope/">
   <soap:Header>
     <t:RequestServerVersion Version="Exchange2010" />
   </soap:Header>
   <soap:Body>
     <m:ExpandDL>
       <m:Mailbox>
         <t:EmailAddress>TestDDL@bhargava.com</t:EmailAddress>
       </m:Mailbox>
     </m:ExpandDL>
   </soap:Body>
 </soap:Envelope>

Response:

 <?xml version="1.0" encoding="utf-8"?>
 <s:Envelope xmlns:s="https://schemas.xmlsoap.org/soap/envelope/">
   <s:Header>
     <h:ServerVersionInfo MajorVersion="14" MinorVersion="1" MajorBuildNumber="269" MinorBuildNumber="0" Version="Exchange2010_SP1" xmlns:h="https://schemas.microsoft.com/exchange/services/2006/types" 
                            xmlns="https://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="https://www.w3.org/2001/XMLSchema" />
   </s:Header>
   <s:Body xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="https://www.w3.org/2001/XMLSchema">
     <m:ExpandDLResponse xmlns:m="https://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types">
       <m:ResponseMessages>
         <m:ExpandDLResponseMessage ResponseClass="Success">
           <m:ResponseCode>NoError</m:ResponseCode>
           <m:DLExpansion TotalItemsInView="0" IncludesLastItemInRange="true" />
         </m:ExpandDLResponseMessage>
       </m:ResponseMessages>
     </m:ExpandDLResponse>
   </s:Body>
 </s:Envelope>

In this case the TestDDL group had members but we got no results. It turns out that this broke as a result of a change trying to synchronize behavior between various Mail Clients. Fortunately, we have decided to fix this and the fix should be available in one of the upcoming Rollup Updates for Exchange 2010 Service Pack 1.

The only workaround I know is of using LDAP to get the membership of a Dynamic Distribution Group if it fits your requirements.

Update:

This issue has been fixed in Exchange 2010 SP 1 RU 5. Exchange 2010 SP 1 RU 5 should be available in August 2011.Unfortunately this has been pushed to Exchange 2010 SP 1 RU 6. However, in case you need an Interim Update for SP 1 RU 4 OR RU 5 when it becomes available, open up a Service Request with Microsoft Support to obtain one.

Enjoy!