MyPhoneExplorer does support Cardbook now directly, i just finished the integration in the beta: https://www.fjsoft.at/files/MyPhoneExpl ... Update.exe
IMPORTANT: You'll need also the - unofficial - Thunderbird addon 3.0.13 for testing: https://www.fjsoft.at/mpe-addin.xpi
After installing the beta and using the 3.0.13 addin you should be able to select also cardbook addressbooks in the settingsdialog for sync in MyPhoneExplorer
many thanks for testing