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Microsoft Exchange 2007 to retire after 2010 is now live

Our receive connector is on our "Exch2010 box".  However, when I unplug our "Exch2007 box" no emails arrive and cannot see Exchange. On 2010 - Exchange Management Console, Mailbox, "Exch2010 box" Properties, System Settings, "Domain controller servers being used by Exchange" = "Exch2007 box".  How to I change this setting?  I am guessing this is what I need in order to retire Exch2007 box.
Note: Server2008R2 running Exchange 2010.  Server 2008 Standard SP2 x64 running Exchange 2007 (old box to bin).  All mailboxes have been moved to "Exch2010 box".  Also have similar issue at a client site  but with same version of Exchange 2007 so would like to know what I have missed during migration.  Both servers are DCs and are GC.
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phillipnor
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phillipnor
2 Solutions
 
Haresh NikumbhSr. Tech leadCommented:
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Simon Butler (Sembee)ConsultantCommented:
If Exchange is installed on a domain controller, then Exchange will only use that DC for DC functionality. It is not recommended to have Exchange on a domain controller.
However if you have installed Exchange on a DC, you cannot remove the DC functionality from it, as it is unsupported and will break Exchange.

Therefore your only option here is to remove Exchange 2007 completely, then restart the Exchange 2010 server. You will be unable to use the "unplug/switch off" method advocated by many to see if things are working correctly because they will break.

Simon.
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