Upgrading from Exchange 2003 to Exchange 2010, routing works in one direction only

exchange-2003exchange-2010exchange-migrationmigrationtesting

I'm in the process of upgrading an Exchange 2003 server to Exchange 2010, and have installed the prerequisites and Exchange 2010 on the new hardware I've purchased.

We use postfix on the perimeter to handle external SMTP connections, and Exchange 2003 is configured to send all external mail via the same postfix instance.

The Exchange 2010 server is now up and running, and I've just performed a mailbox move for a test account to the new server. The mailbox move was flawless, with the client picking up the new server without any problem.

I've then sent an email from the test account (now on Ex 2010) to my own mailbox (still on Ex 2003), which worked fine, but when I reply to the test account, our Exchange 2003 server is attempting to route the message via our postfix instance, instead of routing it to the new Exchange 2010 server.

What might I be missing?

For info, the Exchange 2010 server is installed with the 'typical' roles, as it will be a single server (I intend to keep postfix on the perimeter).

Edit – Output from Get-RoutingGroupConnector executed on the Exchange 2010 server

[PS] C:\Windows\system32>Get-RoutingGroupConnector

Name                      SourceRoutingGroup                             TargetRoutingGroup
----                      ------------------                             ------------------
EX2010-EX2003             Exchange Routing Group (DWBGZMFD01QNBJR)       first routing group
EX2003-EX2010             first routing group                            Exchange Routing Group (DWBGZMFD01QNBJR)

Best Answer

I would run Get-RoutingGroupConnector and verify that you have a connector from your EX03 back to your EX10 environment, and from your EX10 to your EX03. Although, your test seems to indicate that you DO have a connector from your EX10 to your EX03. You may just be missing one from your EX03 to EX10.

IF so you can create a new connector using

New-RoutingGroupConnector -Name ex10-to-ex03 -sourcetransportserver ex03server -targettransportserver ex10server

Add -PublicFolderReferralsEnabled $True to the end of the above command if you need access to Public Folders, across the connector.

Related Solutions

How to copy mailboxes from Exchange 2003 to Exchange 2007 across forests

You can use Move-Mailbox across Forests, you need to make use of the -SourceForestCredential parameter (this all has to be done in the Exchange Management Shell, not console). This article explains in detail how to do it.

The account that is doing the Migration needs to have Exchange Recipient Administrators role or above in both source and target domain, but you do not necessarily need a trust setup. This article contains further information and some useful tips on how things need to be setup for it to work.

However, because of your need to merge the mailboxes and keep them on your old server, this may not be the way to go though, particularly as the user accounts have already been created on your new server. You might be better of using the export-mailbox command to export all your mailboxes to PST files, move them to the new server, and then import them using the Import-mailbox command.

I'm not sure how many mailboxes, or how much data you have, so this may or may not be practical for you, but it will achieve both your aims of keeping the old mailboxes, and merging the data.

Need to Remove Exchange 2003 Server That Crashed During Transition to 2010

Remove the exchange server from the First Administrative Group first.

First if you haven't already promote the new exchange server as the master: go to Exchange System Manager > Administrative Groups > First Administrative Group > Routing Groups > First Routing Group > Members Right click your new server and click "set as master"

To remove the old exchange server go to Exchange System Manager > Administrative Groups > First Administrative Group > Servers. Right click the old server go to All Tasks > Remove server

if you get an error like this

    The Server "SERVERNAME" cannot be removed because:
-One or more users currently use a mailbox on this server. 
These users must be moved to a mailbox store on a different server 
or be mail disabled before uninstalling this server.
Facility: Exchange System Manager
ID no: c103f492
Exchange System Manager

Then Open AD and do a search for all users who have Exchange Home Server attribute set to the dead Exchange Server. Remove Exchange mailbox association if you find any users using the old server.

If you cannot see administrative or routing groups then: Right click your domain (exchange) container (THE HIGHEST LEVEL) go to properties check off the administrative views. "Display routing groups" and "Display administrative groups"

Finally: Delete all the old DNS records for the old server as well as any DHCP records then simply delete the old server from AD this is assuming you were able to transfer all the Schema roles.

Hope this helps.

Best Answer

Related Solutions

How to copy mailboxes from Exchange 2003 to Exchange 2007 across forests

Need to Remove Exchange 2003 Server That Crashed During Transition to 2010

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