Birthdays can be added by opening the address bock in Thunderbird and right-clicking on an entry that you want to edit. Select Properties in the right-click menu and click on the other tab. Custom 1 is the default location for the birthdays. Add the birthday in the format 8.2.2007 (day / month / year).

The new birthday will be picked up automatically by the birthday reminder extension. Two options exist how you will be reminded of birthdays. The first reminder is send by email – you specify how many days in advance you want to be notified and an email will be send with the information about the upcoming birthday.

The second reminder is a simple popup window which opens everytime Thunderbird is opened. I do not like the second option that much because I tend to open and close Thunderbird a lot and it soon becomes annoying to close the birthday reminder popup.

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