title: DynamicsCrm - Retrieve Multiple is not supported
body: <p>I´m developing a data-extraction tool that gets data out of DynamicsCrm.
  I have a few tables tough where i get the following exception:</p>
  
  <pre><code>Additional information: The 'RetrieveMultiple' method does not support entities of type 'mailboxstatistics'.
  </code></pre>
  
  <p>Reading online, using fetchxml is supposed to be the solution.
  For me, it looks like i´m already using fetchxml.
  My code:</p>
  
  <pre><code>    private static EntityCollection RequestEntityCollection(String FetchXML, Microsoft.Xrm.Client.CrmConnection c)
      {
          using (OrganizationService service = new OrganizationService(c))
          {                  
                  EntityCollection r = service.RetrieveMultiple(new FetchExpression(FetchXML));
                  return r;
          }
      }
  </code></pre>
  
  <p>I´m currently using the CRM2013 SDK so EntityCollection is from the  Microsoft.Xrm.Client.dll in v6.0.0.0.
  Also the documentation is using the RetrieveMultiple method.</p>
  
  <p>Do you have some suggestions or is this not supported and the online suggestions are misleading?</p>
  
  <p>Thank you!</p>