The contacts folder sometimes shifts to some other type of folder,
which interferes with using contacts. To correct this, start Windows
Mail, then click on Tools, then Windows Contacts, then right click
in the empty space under the right end of the contacts toolbar, then
click on Customize This Folder, then the triangle to the right of the
folder type, then Contacts, then Apply, then OK. The toolbar in
the contacts window should then include New Contact Group.