Looking for a proof reading program.

A long while ago I found a program (for windows only) that proof read word documents. It is almost like spell check but it actually changes grammar and wording to make the document look more professional depending on the setting. The program had settings such as business, medical, school, etc.

I was wondering if anyone knows what I'm talking about and where I can find it. Also if anyone knows something close (For mac or pc) that would be great too.