[Evolution] birthday in evolution-calender

[Bernhard <bernie-rv gmx de>]

I am using evolution since years on different notebooks and everything
worked fine.
Lastweek I got a new notebook and transfered the data from the old to
the new one.
Nearly everything worked fine, but I could not see the birthdays of the
contacts in the calender as I could on the old notebook.
What should I do?
Thanks for any answer
fergus