Which operating system for Exchange 2019 is unsupported:

Which operating system for Exchange 2019 is unsupported:

• Windows Server 2008 R2
• Windows Server 2012 R2
• All of them
• Windows Server 2012 

EXPLANATION

The supported operating system for Exchange 2019 is only Windows Server 2019 Standard or Datacenter. Windows Server 2019 Core edition is
also fully supported and recommended.

SOURCE

https://docs.microsoft.com/en-us/exchange/plan-and-deploy/system-requirements?view=exchserver-2019#operating-system