It has been already reminded few times but as this is quite important as these versions are still use quite a lot you really need to start thinking to move on from Windows Server 2008 and Windows Server 2008 R2.

They are reaching their end of support/end of life on January 14th 2020.
You have few options available to move on:

  • migrate your 2008/2008 R2 workloads on Azure; you will enjoy additional 3 years of support but you will still have to move to the latest version available at that time
  • upgrade your 2008/2008 R2 workloads on-premises to Windows Server 2016

Additional details available here