What to say to someone you haven't spoken to for four years?

I want to get back in touch with one of my old friends. However, I haven't spoken to her for four years (I'm 18 now, just finished my A Level exams). I've been dying to contact her for ages, but I knew I ought to wait until the exams were finished. Now they have, I don't know what to do. Four years ago we were really good mates (we went to the same primary school, but not the same secondary). I stopped contact with her though, because I was really depressed and couldn't be bothered going out anymore. We had so much in common, I'd love to speak to her again, maybe even try to get things back to the way they were (although I accept she's probably moved on a lot in four years!). So much has happened in four years, I want to find out what she's been up to, there's so much to tell and to hear, so much to catch up on ... if she wants to. She only lives two roads away from me as well. What do you think I should do? I want to text her, but I feel a bit awkward. What would I say? :S

Put the internet to work for you. via Personal Recipe 2629979