This will be a really short post !
In my current assignment, we are preparing a inter-forest migration between two active Directory forests. So far, nothing unusual. There is just only little problem we have discovered. We cannot use ADMT 3.2 in conjunction with Windows 2012/R2 servers.
It’s by Design
We discovered the hard way that the current version of ADMT (3.2) cannot be installed on a Windows 2012 (or later) machine. This is by design. ADMT 3.2 and PES 3.1 are not supported for installation on Windows Server 2012. The installers intentionally block unsupported operating systems. (see http://support.microsoft.com/kb/2753560)
- Set-AdForestMode -identity yourdomain.com -forestmode Windows2008R2Forest
- Set-AdDomainMode -identity YourDomain.com -domainmode Windows2008R2Domain
Using these Powershell cmdlet, you can lower forest/domain level down to Windows 2008 level (I Think)
Future expectations ?
The good news is that Microsoft is working on a new version of the tool which would support the latest Operating system. There is no release date yet but based on this post, the tool should be released during the first quarter of 2014 (which is now !). We have not seen any other announcements yet so we assuming that the ADMT 4.0 will be delivered somewhere in 2014.
If you are like me, busy with migration and where Windows 2012 R2 deployment projects coexists, you might end up in having a issue migrating your Active Directory by using the current version of the ADMT 3.2 tool. The good news is that Microsoft provides a workaround which seems to be usable as long as you do not have enabled feature that specifically requires Windows 2012 R2 Forest/domain level.
The other good news is that Microsoft is working on a new version of the tool which will fully support the latest version of the Operating System. We are just waiting for the tool to be released. As soon as the tool will be available, we will provides some posts on it
Hope this post can help someone
Till next Time