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Uninstall and Decommission Exchange Server 2007 Mailbox from a Passive Cluster Node for Exchange 2010

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  1. Open the command prompt of the Passive mailbox server... make sure you logged in as a domain administrator.
  2. Go to C:\Program Files\Microsoft\Exchange Server\Bin
  3. Type the command setup /mode:uninstall

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Now you have successfully uninstall the Exchange server mailbox role from the passive node, but the cluster environment server information still exists, and we need to remove that as well.

To do that we need to…

  • Open the Cluster Management Tool
  • Expand the cluster resource name
  • Expand the Nodes
  • Right-click the passive node server
  • Click More actions -> click Stop Cluster Service

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Once you click “Stop Cluster Service”, then click More actions again, and then click Evict and click Evict node….

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Once its done , restart the server.

Once the server is up…Follow the Below Steps:

  1. Open the Server Manager console.
  2. Click Features, and then click Remove Features.
  3. Uncheck Failover Clustering.
  4. Click Yes to reconfirm and click NEXT.
  5. Click Remove.
  6. After that, the Server is restarted.
  7. Remove any remaining files and folders from the Exchange Server program files folder and subfolders.

That's the end of Exchange Server 2007 Mailbox de-commissioning on a Passive node….Now go to the Active mailbox server of Exchange server 2007.

This process is not as same like passive node. Here we can’t go with uninstall command only, because this server holds the culstered mailbox server information and it is online. In order to remove this,

Go to the command prompt..change the directory to C:\Program files\Microsoft\Exchange Server\Bin

Type command setup.com /removeCMS /CMSName:<Clustername>

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This will take the mailbox now offline from the cluster…

Now type setup /mode:uninstall

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Once you finish this uninstallation, Exchange server 2007 last mail box has been remove from your domain..now do the evict

Goto command prompt (If the command prompt is open, close it and open it and then type

Cluster <mailbox cluster name> node <nodename> /force

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That’s the end of the “EXCHANGE SERVER 2007 DE-COMMISSIONING PROCESS”

Now you are completely depended on Exchange server 2010.

Reference article from my blog: http://premnair.wordpress.com/2011/03/15/un-installingde-commissioning-exchange-server-2007-mailbox-from-passive-cluster-node-for-exchange-2010/