Not all Windows on my part, but here goes anyway.
Using Windows 7 Ultimate on my gaming machine as dual-boot with Zorin OS (Linux)
On my media center I use Windows 7 Ultimate.
On my home RDP server I use Windows Server 2012 R2.
On my home file server I use CentOS 7 (Linux).
On my first remote dedicated root server, I use VMware ESXi as the hypervisor and run actual operating systems as VMs. Currently I am testing out Windows Server 2016.
On my second remote dedicated root server, I run CentOS 7 as it is mainly an FTP TLS server.
Next to that, I have various laptops running a mix of Zorin OS and Linux Mint.