Tuesday, October 27, 2015

How to downgrade or change Exchange Server Edition

Example scenarios:
Have missed with Exchange Server Edition during initial deployment? 
Want downgrade your Exchange Server Edition from Enterprise to Standard?
Maybe you want to reuse your Exchange Server 2010/2013/2016 as Exchange Server Hybrid with free Hybrid Product key applied?

1. Run ADSI Edit tool: adsi.msc
2. Connect to
3. In connection settings Select a well known Naming Context - Configuration
4. Expand Configuration - Services - Microsoft Exchange - <Name of your Organization> - Administrative Groups - Exchange Administrative Group (FYDIBOHF23SPDLT) - Servers
5. Click Exchange 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

Provided AS IS and don't ask for support.

Successfully worked on some 
non-DAG production.
It should also perfectly work after changing to Exchange Server Hybrid Edition product key as require no mailboxes hosted on it.

I'd be glad to hear if someone will report DAG experience with downgrade. Thank you.