I use Windows Live under Windows 7 OS. This program allows me to create groupings of the original contacts (I handle the membership of an private organization with over 450 contacts).  Yesterday I apparently lost all my contacts.  I had a slightly older back-up in .csv format so I downloaded it.  Now every time I try to access a contact to edit, it tells me information could not be saved - verify information and continue.  I ultimately have to re-input all info whenever I need to edit.  I have looked at Windows 10 email system and could not find the grouping feature.

Moved to      Windows / Windows 7 / Email & communications