windows key +R type contacts and press enter select import from the windows toolbar Now in Thunderbird make the changes I suggest [https://thunderbirdtweaks.blogspot.com/2013/12/windows-contacts.html here ]to use the windows contacts in Thunderbird as an address book. https://thunderbirdtweaks.blogspot.com/2013/12/windows-contacts.html By doing it this way any software your phone has that syncs windows contacts will also sync Thunderbird contacts.