After upgrading to windows 10, my old contact list (about five years old) merged with my People Live contact list, more than doubling my contact list and making the information inaccurate.  Unfortunately, when I back-up my computer, the backup list of contacts only includes the old list from when I didn't sign in to Windows Live Mail - not the current list when signed in.

After many days of trying to correct the list, and deleting the old information which reduced the contacts from over 1900 people to 860, I signed into Windows Live Mail on a second laptop computer that I also upgraded to Windows 10.  Instead of the accurate 860 contacts now on the People Live site, the contact list now showed over 2800 entries.  I quickly disconnected the internet connection so the 2800 entries didn't sync with the newly accurate People Live entries.  I have deleted all contacts on my laptop from the contact list when not signed in and would like to know how to start over with a fresh list when signed in so I can sync with the People Live contact list and reduce the contacts to the accurate list of 860.  Any ideas?  Any suggestions on ways to backup the Windows Live Mail list that shows up while signed in?

P.S.  I did try uninstalling Windows Live Mail and reinstalling Windows Live Mail to see if I could get a fresh list, but it still shows 2800 contacts when I sign in.