The easiest way to synchronize contacts is to install Filemail Desktop. When starting this Application you will be asked if you want to syncronize contacts from Outlook in Windows - or Contacts when running macOS.
You can also visit the contact manager to add, edit or delete any contact. It is also possible to import contacts from several different e-mail providers like Gmail, while we also allow you to upload a .CSV file with addresses to import.
Tip: You can organize contacts into groups - simply by dragging the contacts onto a group.