deleting birthdays

I had several adressbooks with the same persons. Now the calender for birthdays has the same birthday for every "copy" of that person. I have now removed (deleted) the extra adressboks so that every contact is ony once in the adressbook. However, the birthday calender apperantly does not get updated so it doesn't remove the "extra" birthdays.

Possible solutions:

1. manually force Evolution to update the Birthday calender (How do do this?)
2. edit the Birthday calender by hand (where is it?)

Any help is appreciated!

+++Update +++

It seems that Evolution got the hang of it. Anyway, everyone now has only one birthday. Don't ask me how that happend!