In Mozilla Thunderbird, use the menu "Tools" / "Add-ons", click on "Install..." (at bottom left) and select the
![info](/img/w141_ccccccp1.png)
Contact groups will not be synced
![info](/img/w141_ccccccp1.png)
Photos
![photo](/img/z059p1.png)
of your contacts cannot be synced
![info](/img/w141_ccccccp1.png)
When you start Thunderbird, if SOGo ask you your password everytime, install also
SOGo Integrator