Option: Generate Birthday calender out of the contacts
Use the Synergy: add an option to create a birthday calendar out of the contacts data. :)

-
Tom Atkins commented
As a workaround for this I use the following setup:
For desktop with Thunderbird use the 'ThunderBirthDay' addon: https://addons.mozilla.org/en-US/thunderbird/addon/thunderbirthday (There are also addons for birthday reminders)
On Android I'm using the open source 'Birthday Adapter' app which seems to work fine with Fruux. https://github.com/dschuermann/birthday-adapter/issues/81 It has a nice feature to set configurable reminders for birthdays as well as displaying them in your calendar.
-
Anonymous commented
... and that calendar should not only show up in the webview (as other services only do) but also should sync with the devices.