LindowsOS has been out for a while now.

Microsoft has sued Lindows over trademark issues, claiming confusion between "Windows" and "Lindows". The judge decided "Windows" is too generic to be a valid trademark. (This alone should warrant a footnote in computing history for Lindows.)

About the Operating system itself: the Linux community in general doesn't like LindowsOS for various reasons. (The most often-cited being that it runs every program as root).

The company had to lessen the claims of "Windows compatibility". Now it only guarantees a subset of programs to run correctly.