Well I can't yell at you for not searching the topic
,.... soooo here goes. The LimeWire program is perfectly legal. It is a file sharing app that enables users to share files from one pc to another.
The illegal part comes in when people share copyrighted material. What really matters is what is legal where you live, and what you feel comfortable with. Different countries have different laws and you would have to find out what your local laws are to know what is legal to do. LimeWire itself is legal. What you do with it is up to you. There are legal files available but you would have to seek them out.
If your looking for someone to say it's ok to do what ever you want, that would be bad advice, and it would be in poor judgement to take legal advice from a stranger on a forum. Hope this helped
.