Exchange 2003 to 2010 transition

Problem:
    I recently transitioned from exchange 2003 to exchange 2010 both servers are still running side by side on the network and everything is working great. I decided to test 2010 as standalone and turned the old 2003 box off. When I do this email stops flowing to outside addresses, we can still receive from the outside . If I turned the old server back on mail flows again including what what queued up prior to the shutdown.

1) Will this correct itself when I uninstall exchange2003 from my old server?
2) What are the corrective actions (if any) ?
ProperlotAsked:
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Gareth GudgerCommented:
Have you set up a Send Connector on the Exchange 2010 server yet? If not, you will need to do that.

Also, make sure your firewall is allowing port 25 from the 2010 server.
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Gareth GudgerCommented:
I also highly recommend following this article for the decommissioning process of Exchange 2003. There are many things to check before you uninstall.
https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/
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ProperlotAuthor Commented:
diggs
Funny thing is after I posted I started to look around and noticed my send connector on the 2010 box was disabled. Not sure why where when or how. Either way its working noe when I shut down the box thanks for the link for the decomm checklist...
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