Which ldap attribute to add for birthday field for GAL and Kolab users?

[René van Dorst]

I see a lot a notes about the birthday calandar. 
Is a good feature.
But I can't find any information howto or what ldap attribute I have to add to make it work.

So Which ldap attribute I have add as birthday field for GAL and Kolab users?

Greats,

René van Dorst
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