Certificate Server Upgrade

I can confirm Wendy’s answer. A Windows Server 2012 (both standard and R2) ADCS is compatible with a Windows Server 2008 (R2) Active Directory. The only thing you won’t have available are version 4 templates, but you only need those if you use Key Attestation (rare). Kind Regards,. 6 minutes ago.

Windows 2008 VPS via Certificate Server Upgrade.