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Exchange 2003 2010 coexistence. Mail not flowing betweeh 2K3 FE and 2010 Server

Posted on 2010-11-12
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Last Modified: 2013-11-15
Hello everyone and thanks in advance;

I currently have a Exchange 2k3 and 2010 co-existence deployment.

I have an Exchange 2003 Back End and Front End. Users can connect to the FE and get mail via OWA and RPC over httpc and active-sync

I have a mailbox on exchange 2010, it can not send mail out. Its mail is routed to the 2k3 FE. But all the communication between the FE and 2010 server seems to keep getting stuck in the respective queues of each server.

I will provide any information require and appreciate any assistance that can be offered.
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Question by:IT_HH2010
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Author Comment

by:IT_HH2010
ID: 34128650
I have mail flowing from the exchange 2010 server to and from the internet. I cant how ever send to users whos mailbox is on the 2k3 server
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endital1097 earned 500 total points
ID: 34129326
first make sure you have the routing group connector
from the 2010 server run the following
Get-RoutingGroupConnector

the results should have two entries (one for each direction)
if not, you need to run
New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Hub2010.contoso.com" -TargetTransportServers "Bridgehead2003.contoso.com" -Cost 10 -Bidirectional $true

you also want to look at your 2003 server
in exchange system manager check the smtp virtual server settings for connection control and smart host configuration
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Author Comment

by:IT_HH2010
ID: 34129344
There wound up being dns errors, as well as some configuration on the 2k3 connectors that needed changing.
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Expert Comment

by:endital1097
ID: 34129433
good to hear your working and thanks for the points
have a great weekend
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