Thanks for the suggestion about KLS Mail Backup.
I try it but i found a (big) problem
This is my configutation:
Windows 7 Enterprise 6.1 Build 7601 SP1
Windows Live Mail 2011 Build 15.4.3538.0513
These are my steps :
1. With KLS Mail Backup v.126.96.36.199 i backup with profile “Windows Live Mail”
2. I create a new contact like firstname.lastname@example.org
3. I restore the backupd created at the point 1.
but ...i see again email@example.com
!! Why the old contacts file isn't replace ?
Someone can check if the contacts backup run fine ?