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Exchange 2010 to Exchange 2003 Routing Group Setup

At Site 1, I have a 2010 Exchange server (S1A) and Exchange 2003(S1B) and at Site 2 I have Exchange 2003(S2A).
Site 1 and 2 are connected by a VPN, in different States, and both Sites are part of the same domain.
At moment I have a tangled mess of RG definitions and some external Emails are getting stuck in wrong queue (S1B). I want to fix this problem and remove Exchange server 2003 (S1B).
So I have will only have 2010 (S1A) at site 1 and 2003 (S2A) at Site 2.

Here is how RG’s are configured now:
Site 1 Definitions
Exchange Routing Group (DWBGZMFD01QNBJR): (SMTP too)
         S1A to S1B (Site 1 2010 to 2003)
RG 1:
         S1B to S2A (Site 1 to Site 2 connector between 2003 servers)
         S1A to S1B (Site 1 2010 to 2003, connector back to 2010)
         OutMail  (SMTP connector outgoing mail ..blocked queue)

Site 2 definitions
RG 2
         S1B to S2A (Site 1 to Site 2 connector back between 2003 servers)

Get-RoutingGroupConnector results show:

Name                   Source                                              Target
S1B to S2A                 RG1                                                    RG2
S1B to S2A                 RG2                                                    RG1
S1A to S1B                 Exch. RG (DWBGZMFD01QNBJR)    RG1
S1A to S1B                 RG1                                                    Exch RG (DWBGZMFD01QNBJR)


What I am asking advise on is what is the best way (order to proceed) to achieve what I want, which is Site 1 with Exch 2010 and Site 2 2003 Exch. 2010 is a CAS server. Site 2 relies on it for ext mail.

Many Thanks
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Having reviewed this in detail, from writing it down, I have a Send connector on 2010 and in the 2003 in Site1. 95-98% of email go out OK. It's just a few email domains that get stuck in Site 2003 Outgoing queue. One not going out is a problem :)
Either way that 2003 server is going away. No complaints from EXBPA.
My main thing here is to undo the RG setup in place and put in a new RG setup from Site 1 2010 to Site 2 2003. I think taking the uneeded 2003 at Site 1 will cure queue blockage on some emails
Any advise on how do do and in what order?
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Simon. I want to remove the 2003 Server at same Site as 2010. So with that in mind are you suggesting create a bidirectional RG between 2010 Site 1 and 2003 Site 2 then remove all the other RG's

If an RG exists between 2003 and 2003 then remove using Sys Mgr and if RG between 2010 and 2003 remove from 2010 script? Right

I have a send connector on the Exch 2010 so do not need on 2003 at same site.
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Rancy.
So  I can set up in 2010 for send connector to use a particular domain. Just create another one?
Not sure I understand this term Appliance Relaying? Can you expand?
Everything is on 2010 Mailboxes, PF, etc. Do I delete the current RG connections before add new one (2010 Site 1 to 2003 Site 2) or does it not matter
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Rancy
No issue with the E2k10 server but E2k3 server relies on internet mail coming in from E2k10 which acts as CAS server. So do I not need a RG between then? At moment only link between Site 2 is via Site 1 E2k3 server which I am retiring?
Nigel
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Yes mailboxes on the Site 2 E2k3 server. External EMail from what I have mapped out in intial question come in and out through E2k10 server. The site 2 server does not have an SMTP connector that I can find. So need this new connector right?

Nigel
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I think I got off my main question here.
What I am looking for in a answer to my question is I want to remove server e2k3 (s1B)  at site1 so I just have two Exchange servers remaining in the organization e2k10 (S1A) at site 1 and e2k3 (S2A) at site 2.
So I will also need to cleanup RG and connectors.
Based on RG shown in my question what routing group(s) should be in place? What do I need to remove or reconfigure. Cleanup.
Thanks Nigel
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I got the specifics I was looking from from another site but the comment in this discussion lead to that sloution