We have a single Exchange 2003 server up until this weekend. We'd installed a new Exchange 2010 server with co-existance in mind. After a successful installation, we're faced with the problem that there is no mailflow from 2010 to 2003. I've created a user with a 2010 mailbox for this test. No 2003 users have been migrated to 2010.
1. Emails from 2010 user is unable to send to external recipient (stuck in queue).
2. Emails from 2010 user is unable to send to 2003 reicipient (stuck in queue).
3. Emails from 2003 users to 2010 user successful.
4. Emails from external sender to 2010 user successful.
I have removed and recreated the Routing Group Connector according to Microsoft and the results are the same. It's bi-directional for the RGC.
We have a BES and I have checked these instructions and applied them and results are still the same.
Can someone shed some light?