It is not possible to install Windows 2003 R2 Domain Controller in an AD with "Windows 2008/R2" Functional level of Forest/Domain. However, you can lower the functional level back to Windows 2003, please refer the below link:
It is not possible to install Windows 2003 R2 Domain Controller in an AD with "Windows 2008/R2" Functional level of Forest/Domain. However, you can lower the functional level back to Windows 2003, please refer the below link:
It is not possible to install Windows 2003 R2 Domain Controller in an AD with "Windows 2008/R2" Functional level of Forest/Domain. However, you can lower the functional level back to Windows 2003, please refer the below link: