Is it possible that a Advanced Availability (AA) Environment can operate with different Operating Systems?

Document ID : KB000077731
Last Modified Date : 10/05/2018
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Introduction:
I can add a new node to Service Desk Manager AA Environment with different operating system, in our case, current nodes are Windows 2008 R2, and new node will be Windows 2012 R2.
Question:
Is it possible that a Advanced Availability (AA) Environment can operate with different Operating Systems?
Environment:
CA Service Desk Manager 14.1 / 17.x
Answer:
Cross platform is not supported, it might work, but not supported.