Hello,
Such In-place upgrade is supported. However, it is not recommended to proceed like that for a DC. Details about in-place upgrade:
http://support.microsoft.com/kb/2255099For that, I would recommend proceed like the following:
Make sure that each DC is a DNS and GC serverMake sure that there no AD replication issues using dcdiag and
repadminChoose a DC and demote it. Before doing it, you have to move its FSMO roles to another DC if it is an FSMO holderRe-install the OS of the old DC so that it will use Enterprise EditionPromote again the DC and make it a DNS and GC serverDo the same for the second one
That is the most recommended way in your case.
Please note that Standard edition is enough for DCs. If you are planning to use applications / clustering on them then this is not recommended.
This
posting is provided "AS IS" with no warranties or guarantees , and confers no rights.
Microsoft
Student Partner 2010 / 2011
Microsoft
Certified Professional
Microsoft
Certified Systems Administrator: Security
Microsoft
Certified Systems Engineer: Security
Microsoft
Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration
Microsoft
Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration
Microsoft
Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration
Microsoft
Certified Technology Specialist: Windows 7, Configuring
Microsoft
Certified Technology Specialist: Designing and Providing Volume Licensing Solutions to Large Organizations
Microsoft Certified IT Professional: Enterprise Administrator
Microsoft Certified IT Professional: Server Administrator
Microsoft Certified Trainer
Need to support users over the internet?
click here try our remote control online beta