We recommend choosing Windows Server 2019.
It’s FAST and SECURE.
It is the best Windows version available for now.
Windows 7 / 2008 are field proven, reliable and predictable versions of Windows.
You can also choose Windows 2012 R2 without any problem either.
However these operating system will not be supported by Microsoft in the future.
Windows 10 PRO and Windows 2016 are also supported by RDPlus even if they are still not stable enough.
Usually, our customers prefer to use virtual environment and/or Cloud hosting solutions to deploy their RDPlus environments.