I am having problems with universal distribution groups.
We are migrating from Exchange 2003 to 2010 for our parent domain users. Both Exchange servers are in the same domain.
Our child domain users are on a Google app server, with their email address in AD.
All users use Outlook 2010 as the email client.
The distribution group contains user from the parent domain (exchange users) and the child domain (Non-Exchange mail users).
If an Exchange 2003 user sends to the group it works, all recipients get the message.
If an Exchange 2010 user sends to the group, only the exchange (both 2003 and 2010) users get the message, no child domain (non-Exchange) users get the message, no NDR generated, no error given.
The message tracking log show the group being expanded, but only lists the exchange users, no non-exchange users shown and no errors raised.
An Exchange 2010 user expanding the group in the “To...” line of a new outlook message sees all of the recipients.
As a short term solution, I set the expansion server property of the distribution group to the Exchange 2003 server, now all users can send to the group successfully.
Since we are migrating away from the exchange 2003 server, I need to know why the exchange 2010 server can’t send to the distribution groups.
Any help would be appreciated.