Actual installed OS is Windows Server 2016 Standard, VSphere Client > Virtual Machines list shows it's Windows Server 2012. And for installed Windows 10 Pro, Vsphere Client reads it as Windows 8. I suspect that because I'm using an old build of the software and Windows Server 2016 and Windows 10 Pro doesn't exist yet when this build has been released. I hope someone can confirm this.
vSphere Client v5.5.0 build 1880841
VMware vCenter Server v5.5.0 build 1891313