None of our Ex2010 users are receiving external inbound email.
We have the following:
All inbound email hits our Ex 2003 Bridge Server before either passing the mail onto Outlook 2003 mailboxes, or onto our HubCas Ex 2010 server for 100 Outlook 2010 users.
All Outbound email also pipes through the 2003 Bridge server so at the moment all 2003 mailboxes/users can send and receive internal and external emails so no problems there.
The 100 Ex2010 mailboxes can send internal and external Outbound email, However, No Ex 2010 mailboxes are receiving any external inbound email which is currently queuing on the 2003 Bridgehead server.
No one is aware of any changes been made so the only area I believe I should be looking at is the Legacy Routing Group Connector on the 2003 Bridgehead server, however, I don't want to make any changes and cause other issues.