Exchange 2003-2010 Connectors

I'm configuring Exchange 2010 to Coexist with a single Ex2003 server on an isolated site
2 x MBX 2010 servers and 2 x Hub/CAS are in play but not fully, as I will be re-routing the Mail Gateway server this evening to point/route SMTP traffic over port 25 away from Ex2003 and over to the Ex2010 CAS servers.

However, on the Ex2003 server under 'First Admin Group' > 'Routing Groups' I have made sure the RGC Connector is there but we have 4 other Connectors. SMTP Connectors pointing to the Mail GW server and a couple of other Routing Connectors.

Do I need to point those 4 connectors to the Hub/CAS servers as opposed to the Gateway, or does Exchange automatically ensure the Mail Flow is correct when coexisting? Thses 4 additional connectors are visible on Ex2010 EMC, just didn't know if I need to do anything with them.
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CTCRMInfrastructure EngineerAsked:
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Well exchange will co-exist only when you add the exchange server as a member of that addtional 4 routing group connector.

Thanks
Manikandan
CTCRMInfrastructure EngineerAuthor Commented:
On Ex2003 I have:
Exchange Administrative Group = 4 new Ex2010 servers and one Exchange Routing Group
First Administrative Group = 1 current Ex2003 server, and 4 connectors in the 'First Routing Group'

Do I need to do anything with the 4 Connectors in the First Admin Group to support Coexistence with the new Ex2010 servers?
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

You need to specify more than one source server and more than one target server for the routing group connectors between your Exchange 2010 routing group and Exchange 2003 routing groups to provide redundancy and server availability. Hence you need to add the Ex2010 server on the 4 connectors which you have created on 2003 Server.

Refer the below link.

https://technet.microsoft.com/en-us/library/dd638103(v=exchg.141).aspx

Thanks
Manikandan
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CTCRMInfrastructure EngineerAuthor Commented:
I do have the Interop RGC connector visible is both Server Routing Groups
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

When more than one routing group is defined in an Exchange 2003 organization, you must manually create routing group connectors to enable mail flow between Exchange 2003 servers in different routing groups. The routing group connector must specify a source server and a target server as the connector endpoints. A routing group connector defines a one-way connection, and a reciprocal connector must be created to establish mail flow in both directions. The source and target servers are the bridgehead servers for the routing group. The bridgehead servers relay e-mail to other routing groups on behalf of other servers in their routing group and receive e-mail from other routing groups for delivery to other servers in their routing group.

Thanks
Manikandan
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Hence you mentioned you have addional 4 routing group defines you need to create routing group connectors to enable mail flow between Exchange 2003 servers in different routing groups. I do understand that Interop RGC connector visible is both Server Routing Groups but for the additional 4 ones you need to create addional connectors to enable mail flow between exchange 2003 and 2010 to support co-existence.

Thanks
Manikandan
CTCRMInfrastructure EngineerAuthor Commented:
Hi,

The 4 Ex2003 Connectors in the First Admin Group are already visible on both Ex2010 Hub/CAS servers (Send Connectors), I didn't have to add them, they appeared during Ex2010 install and Role configuration, however, I cannot see the Interop RGC on the Ex2010 servers.

I can see all of the Ex2003 Mailboxes on Ex2010 servers so 2003 & 2010 are aware of each other it's just making sure when I point the Mail Gateway Routing Group away from Ex2003 and point it to Ex2010 that Mail Flows.

To be honest I'm not going to know Mail Flows until the change is done and tested.
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Run the following command to create InterOP RGC Connector in exchange 2010. if the InterOP RGC Connector is created exchange will provide co-existense between 2003 & 2010. However this also true if you have more than one routing group defined on exchange 2003  you must manually create routing group connectors to enable mail flow between Exchange 2003 servers in different routing groups. The routing group connector must specify a source server and a target server as the connector endpoints

New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Ex2010Hub1.contoso.com" -TargetTransportServers "Ex2003BH1.contoso.com" -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true

After you perform this you need to create legacy host name this will proxy any users who connect to exchange 2010 and if their mailboxes exists in 2003. Exchange 2010 will proxy it to exchange 2003 front end server.

You also need to Outlook anywhere, OAB, WebService Virtual Directory, Active-Sync, ECP & OWA to point to exchange 2010. In order for your email flow to work correctly even you redirect your mail gateway to the new server. These steps are mandatory for a smooth migration.

For detailed steps i would encourage you to please visit this link. You will get a complete idea

https://technet.microsoft.com/en-us/library/dd638130(v=exchg.141).aspx

Thanks
Manikandan

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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Therefore before pointing the mail gateway to exch 2010 make sure that you followed all the steps mentioned on my previous post.

Download this pdf which has step-by-step instructions.

http://exchangeserverpro.com/wp-content/uploads/2011/02/Exchange-Server-2003-to-2010-Migration-Guide-V1.3-Planning-Chapter.pdf

Thanks
Manikandan
CTCRMInfrastructure EngineerAuthor Commented:
Hi Manikandan

I don't have mail flow currently but that will follow after Email Gateway routing configuration. However I was able to migrate a test mailbox from the 2003 server to a store on 2010 which didn't work for a while until I established that TCP port 1201 had to be opened on the firewall between the 2 Exchange environments so something else for me to document.

Thanks for your support with this.
CTCRMInfrastructure EngineerAuthor Commented:
Thanks for your support
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