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Add the bday to the calendar and right click the event to get info. You can set up an email alarm at a certain time for the particular event.
 
oh thanks, the thing is that the birthdays appear be default from the info on address book, so i would have to do that one by one, is there any that it sends me a mail by default for every birthday? if not than i would have to rely on the birthday reminders myspace sends :p XD
 
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