I know Unity hasn’t been compatible with .net 4 until now.
But as far as i know unity 3.5 uses MonoDevelop 2.8 wich i read it’s supossed to be compatible with .net 4. So, Is Unity 3.5 compatible with .NET 4?
Unity doesn’t use .NET, it uses Mono. MonoDevelop and Mono are two different things; MonoDevelop 2.8 is basically a code editor and has nothing to do with compatibility. The version of Mono used in Unity is 2.6, which is approximately equal to .NET 3.5.