What do I need to do

As I posted before I have nothing but problems with Live Mail 2011 since its update. At times it says I have no mail, although I can see it on another server. It says it sends mail but sendee never gets it. And now I get mail but will not have attachment.

Now I want to unistall the latest version and go back to an earlier one. How do I save my email conatcts to bring them into this earlier version.

Is this what you're looking for:
How to Export Contacts and Email Addresses from Windows Live Hotmail - About Email

If you are talking about the desktop application from the Essentials package, called "Windows Live Mail" just go to the contacts pane and use the export/import option. I'd choose "csv".