Is there any legal problems for design an operating system?
My wondering is a Programming/Business question, so here what I am thinking about,
One of my big goals is to design a Computer Operating System, however if it will be just for fun, knowledge or even to be the next Windows or Linux, so if I had Programmed one, with GUI
(windows,lists,buttons,etc..) and for example I will make it for Commercial use,

Will Microsoft or Apple comes and drop me in legal problems just like what happened in GUI war between the two of them(Apple and Microsoft)?
Thanks.
Is there any legal problems for design an operating system?
===

My wondering is a Programming/Business question, so here what I am thinking about,
One of my big goals is to design a Computer Operating System, however if it will be just for fun, knowledge or even to be the next Windows or Linux, so if I had Programmed one, with GUI
(windows,lists,buttons,etc..) and for example I will make it for Commercial use,

Will Microsoft or Apple comes and drop me in legal problems just like what happened in GUI war between the two of them(Apple and Microsoft)?
Thanks.