Exchange 2007 & 2003 Co-Existance - One way mail flow to 2003 Only!

Have you created a receive connector on the exchange 2007 server that has permissions for Exchange servers?

Can you create a recieve connector through the Console and select Accept Email from the internet?

Also, I assume the Accepted domains has been populated and Address Address Lists are complete?

No, b/c the Recieve Connectors appeared to been created automatically.   have two default Recieve Connectors already present: 'Client Exch2007' and 'Default Exch2007'.  Both are set to recieve mail from '0.0.0.0'

Yes, the Accepted Domains show all 3 of my domains that my Exchange 2003 processes.

Do any of the recieve connectors alow anonymous access?

No; one is for Exchange clients and the other appears to be for Exchange Servers/egacy

On the Permission Group can you tick Anonymous Users and Exchange Servers as a test?

If you enable full logging on the Exchange 2003 Virtual Server and and paste in the communication between the two servers?

I have modified the 'Default Exch2007' Receive Connector Permissions Groups tab to allow for Anonymous Users, which is in addition to Exchange Users, Exchange Servers and Legacy Exchange Servers.

Enabled Verbose logging, BUT nothing logged to:
C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\ProtocolLog\SmtpReceive

This is what I get in App Event Log:

Event Type:      Warning
Event Source:      MSExchangeTransport
Event Category:      NDR
Event ID:      3006
Date:            7/21/2008
Time:            10:44:15 PM
User:            N/A
Computer:      NYC-EXCHANGE
Description:
A non-delivery report with a status code of 4.4.7 was generated for recipient rfc822;wcsupport@domain2.ORG (Message-ID <967C2BDBF00CDC4DAD5A65527E95294902AFFE9D@nyc-exchange.domain1.ORG>).  
Cause: Message in queue has expired.  The sending server tried to relay or deliver the message but the action could not be completed before the message expired.    
Solution: This message usually indicates a problem on the receiving server.  Check the validity of recipients address and verify that the receiving server is configured to receive messages correctly.  Resending the message will place it again in the queue, if the receiving server is up, message delivery will succeed

Can you paste the SMTP log of the Exchange 2003 Server?

c:\windows\system32\logfiles\smtpsvc1\*.log?

I scanned the logfile for today and it does not show any handshakes with my Exch 2007 hub/mailbox/client Server.  Wouldnt this traffic not traverse using SMTP but instead over the Connector?

Does Message Tracking on the Exchange 2003 server shed any furtehr light on the issue?

States:

smtp message submitted to adv queuing
smtp started message submission to adv queue
smtp message submitted to categorizer
smtp message categorized and queued for routing
smtp message queued for local delivery
smtp message delivered locally to user@domain.org
smtp store driver: message delivered locally to store to user@domain.org

So that would indicate that the email arrived at its location.

You would think so, BUT it never shows up in the 2007 Mailbox inbox and the 2003 sender eventually gets a NDR as noted above.......

Anyone else have any further insight?

I have reviewed and applied the following KB's w/o resolution:

http://technet.microsoft.com/en-us/library/bb124011(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/cc411329(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/aa998604(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/bb124350(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/aa997292(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/bb125223(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/aa998186(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/bb691187(EXCHG.80).aspx

Any additional help would be much appreciated...

To expedite the resolution, I am going to get M$FT involved...

Anyone with advise in the meantime is welcome.  I'll post M$FT's findings soon hopefully...

After analyzing the issue further, I decided to remove a populated Exch2003 SMTP Virtual Server SmartHost entry, which was for an upstream SMTP Security Appliance as a test and restarted my VSMTP server.  This resolved the issue and allowed Exch2003-->Exch2007 mail flow.

However, I am figuring out a way to re-introduce this Exch2003 SmartHost for necessary SMTP granular logging and security requirements.  Once I determine this, I'll post my findings.

Thanks all!

I have read and confirmed the best place for use of a smarthost in a co-existing exch2007 & exch2003 ogranization is on the exch2007 Edge Server EdgeSync to Internet send connector under the network tab.

Is this what you meant?

The only thing left for my migration at this point is, getting my BES to work in a exch co-exist....may require a new Question here....

Thank you for you interest and attn here