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Exchange2010 implementation in Exchange 2003 environment

Hello Experts, I have an Exchange 2003 organization running with 20 mailboxes. I have succsessfully installed exchange 2010, created the connector in Exchange 2003 administrative group which allowed me to send to exchange 2010 mailboxes, however when I send from Exchange 2010 mailboxes to exchange2003 mailboxes I receive the following error:
Identity: MODAEXCOMVM1\Unreachable\111
Subject: RE: ssss
Internet Message ID: <30DFAD911C11AF43AE078605F773A9CE4B0D09@MODAEXCOMVM1.eddie.local>
From Address: EXCHANGE2010@eddie.com
Status: Ready
Size (KB): 27
Message Source Name: FromLocal
Source IP:
SCL: -1
Date Received: 4/28/2011 3:20:13 PM
Expiration Time: 4/30/2011 3:20:13 PM
Last Error: There is currently no route to the mailbox database.
Queue ID: MODAEXCOMVM1\Unreachable
Recipients:  EXCHANGE2003@eddie.com

I tried creating a connector to send to Exchange 2003 server, however it did not resolve the issue. Please advise.
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1 Solution
You have to do it in powershell
New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Ex2010Hub1.contoso.com" -TargetTransportServers "Ex2003BH1.contoso.com" -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true
EddieITAuthor Commented:
I ran the creation of the new group connector, but go the erro below in regards to the public folder referals option. I removed that option and succsessfully created the connector, all e-mail communication is now up and running betweeen the servers, but the public folders are not available.

New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "MODAEXCOMVM1.MODA.local" -TargetTransportServers "modaex.moda.local" -Cost 1 -Bidirectional $true -PublicFolderReferalsEnabled $true

In exchange 2010 did you create a public folder store?  I think it does not create one by default now.

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