*Bulletin ID* A2E_190
*Last Review* 05/13/2010
*Revision* 1.0
*Previous IDs* None
*Obsoletes* None

Disabling IPv6 No Longer Required on Server 2008/2008 R2


Our installation instructions for Exchange 2007 on Server 2008 and Server 2008 R2 formerly said that you needed to disable IPv6. This is no longer required since Microsoft Exchange 2007 Update Rollup 5. If you have already disabled IPv6 and Add2Exchange is currently working, you do not need to re-enable IPv6.


In early versions of Exchange 2007 on Windows Server 2008 and Server 2008 R2, IPv6 would prevent programs using CDO connections (such as Add2Exchange) from communicating with the Exchange server.

At the time, Microsoft recognized the issue and released a utility to disable IPv6 on the Exchange server. This would enable Add2Exchange to work with Exchange 2007, and instructions for the utility were included in our installation procedure.

As of Exchange 2007 Update Rollup 5, Exchange has been fixed and it is no longer necessary to disable IPv6 on the Exchange server. Our installation procedure has been updated to reflect this fact.

If you have already disabled IPv6 and are functioning, you do not need to reenable IPv6.


If you have not applied the latest Exchange 2007 Update Rollup, you may do so through Windows Update. Make sure you have configured Windows Update to update all Microsoft products on your server. This function was formerly called Microsoft Update on previous versions of the operating system.

If you would like to re-enable IPv6 on your server, then export and delete the DisabledComponents registry value described in the following Microsoft knowledgebase article. Working on your registry can cause damage to your system, so follow these instructions with care:


Applies To

  • Add2Exchange Standard
  • Add2Exchange Enterprise
  • Exchange 2007
  • Exchange 2010
  • Windows Server 2008
  • Windows Server 2008 R2

Keywords: IPv6, Server 2008, Server 2008 R2, Exchange 2007, Exchange 2010