Coexistence of Exchange 2003 and 2007 Settings

We currently have a stand alone install of Exchange 2003 on Server 2003 fully updated in all respects. I have installed Exchange 2007 on Server 2008 fully updated in all respects. I am clearly missing something that I hope is easy. After the install I migrated one mailbox (my own) over to Exchange 2007 and everything worked fine. I sent an e-mail to my co-worker internally and sent an e-mail to my hotmail account and then back into my exchange mailbox and everything was good to go. I left for the night and the next morning I see all e-mail are somehow stuck in the queue. The error was "A local loop was detected" Basically nothing has worked right from the that point on. I finally deleted all send and receive connectors and my Exchange 2003 is now fully functional. What send and receive connectors do I need to configure exactly in order for both these systems to be functional long enough for me to migrate all users to 2007. Also how exactly does the e-mail get sent out during this "coexistence" does all e-mail get sent out my 2003 Exchange?
PE_IT_TEAMAsked:
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PE_IT_TEAMAuthor Commented:
How do I set this up step by step in the Exchange 2007 GUI?
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PE_IT_TEAMAuthor Commented:
Below are some details: "Exchange" is the 2003 box and "Exchange2" is the 2007 box.
Also I have no send or receive connectors configured in the 2007 GUI, what needs to be done there?
Thanks in advance.


[PS] C:\Windows\System32>Get-RoutingGroupConnector

Name                      SourceRoutingGroup         TargetRoutingGroup
----                      ------------------         ------------------
EXCHANGE2-EXCHANGE        Exchange Routing Group ... First Routing Group
EXCHANGE-EXCHANGE2        First Routing Group        Exchange Routing Group ...
Interop RGC               First Routing Group        Exchange Routing Group ...
Interop RGC               Exchange Routing Group ... First Routing Group
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PE_IT_TEAMAuthor Commented:
I also just suppressed Link State Updates on the Exchange 2003 Server and re-booted.
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PE_IT_TEAMAuthor Commented:
Another comment of interest: Our company only has about 100 users. I could move all mailboxes after hours to the new 2007 Exchange system. Then un-install 2003 system, any reasons I should not or considerations for this approach?
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gupnitCommented:
Hi,
Apologies was away as have been in office for 39 hrs now,...stuck on some server issue. Taking a break right now so answering ;-) !
Thumb Rule - First make sure that 2007 is working fine then remove 2003.
Please delete all Routing Group Connectors and create again from the links I gave above. It eill be a simple command new-routinggroupconnector with the parameters
Let me know
Thanks
Nitin
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PE_IT_TEAMAuthor Commented:
I have read the links you gave me and I appreciate the input. I suppose I do not really understand how this all works. I have the single-stand-alone 2003 server that takes care of all of our e-mail functions. I want to transition to Exchange 2007, however when I installed Exchange 2007, I configured a send connector, and they started getting thousands of "A local loop was detected" I acted in a rush and deleted the send connector I created and the default recieve connectors. The 2003 server is the only server that can access the outside world via our mail DNS records. How would the 2007 server send and recieve e-mails if it has a different internal and external IP (if I were to give it an external IP)? Also it won't let me remove the last two connectors , because it is saying it's a duplicate name connector. If you could tell me how this all functions I would probably be able to figure it out if I knew the general concept, which I am sure I do not understand at this time.

Much thanks in advance!
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gupnitCommented:
Hi,
I seemed to have lost track of your thread.
Is it still an issue...let me know so that I can focus on it and help resolve
Thanks
Nitin
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PE_IT_TEAMAuthor Commented:
I was able to fix this problem by creating a legacy connector on the 2003 Exchange Server. After I had all the mailboxes migrated to 2007, I deleted the legacy connector.
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