Exchange 2003 to 2007 routing issue

I have Exchange 2003 trying to migrate to 2007 but over the weekend the email routing to the 2007 exchange server stopped can someone please help.  I can still send from the 2007 clients to the 2003 but not receive from the 2003 clients.
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Rick FeeConnect With a Mentor Messaging Engineer - Disaster Recovery EngineerCommented:
Remove and recreate the Routing group connectors:



New-RoutingGroupConnector -Name Interop Exchange 2003 -SourceTransportServers exchange2003.localdomain.local -TargetTransportServers exchange2007.localdomain.local -Cost 1 -Bidirectional $true -PublicFolderReferralsEnabled $true

If this does not help run the Exchange BPA, fix any errors that might come up...was there anything changed in last week?  

Possible solution#1:
SMTP virtual server setting on the 2003 Exchange box needs to be Windows Integrated
in order to communicate with the Exchange 2007 server.

Possible solution#2:
Check your routing group connector.  From E2K3, check the configuration.  You won't be able to modify it from admin console.  It might be pointing to the wrong server (occured after I decommissioned a server)

Are you getting any error message on Exchange 2003?

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