will .net 3.5 supports linq?

ASP.NET 3.5 is having the following main features which are not availablle in the prior releases

1) AJAX integration
2) LINQ
3) Automatic Properties
4) Lambda expressions


My doubt here is in asp.net 4 ,we are using LINQ operations.so version 4 also supports LINQ
and 3.5 also suppport LINQ as said above.Is that come in difference between 3.5 and 4?

[Resolved]