June 1, 2012

Exchange 2010 - License Downgrade

1. Run ADSI Edit tool
2. Connect to
3. In connection settings Select a well known Naming Context - Configuration
4. Expand Configuration - Services - Microsoft Exchange - "Name of your Organization" - Exchange Administrative Groups - Exchange Administrative Group (FYDIBOHF23SPDLT) - Servers
5. Click server Properties
6. Clear msExchProductID attribute
7. Restart Microsoft Exchange Information Store service if server holds mailbox role
8. Enter New Product Key using Exchange Management Console or PowerShell
Set-ExchangeServer -Identity Server1 -ProductKey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx 
9. Restart Microsoft Exchange Information Store service

If you have mailbox server with database more than 50Gb check next: http://technet.microsoft.com/en-us/library/bb232092.aspx


  1. Very usefull information - thanks a lot.
    Sure did solve my problem!

    A bit more information.


  2. Do you know if this procedure also works with Exchange 2013 servers?

  3. Actually never tried. Let me know if it works with it.

  4. Can anyone confirm this works, even after applying and running for an extended period of time?

  5. I can ensure that it works. Even more, you can upgrade successfully to 2013 and migrate to O365 without any issues.