Ylmf OS is a Chinese Ubuntu-based distribution, originally not in English but now available as such.
While ordinarily an Ubuntu-like distribution wouldn't be something special, especially since most of them use standard GNOME, the UI of Ymlf OS is an almost perfect clone of Windows XP. What is surprising is that Microsoft has not and doesn't look like it will take any legal action for this.

Don't ask me what "Ylmf" stands for, or even how to say it for that matter. I don't know.

Most of the websites about it are Chinese, and the Chinese-roots are very obvious throughout the OS, however the person who translated it seems to have done a relatively decent job.

Wow, that's convincing. At a quick glance you wouldn't be able to tell this is Linux if it didn't have "Ylmf OS" plastered all over the desktop. Apart from the desktop icons, the icon in the Start button, and the presence of a virtual workspace switcher, this is basically a point-by-point Luna clone.

Disappointingly the menu is just a bog-standard Linux menu.

The file manager has remained mostly undoctored, but take a look at those title bars! It's almost perfect.

Firefox running under Ylmf OS.

For a control panel, Ymlf OS seems to use this thing called Ailerus.

Shutting down Ylmf OS.