Most major companies use Linux in their data centers. Mine has several thousand servers, spread over multiple data centers world-wide! In fact, if you want to work in IT or engineering here, you HAVE to be Linux/Unix savvy. My suggestion? Install a virtual machine manager on your PC, such as VirtualBox (free), and install a Linux enterprise distribution (Suse, CentOS, etc) in a virtual machine. Then, start working with it.