From Noel Danjou:
Birthday Reminder is a small application that takes place in the system tray. It searches your default Windows Address Book (WAB) and possibly displays the contacts who have their birthdays today. If some birthdays are available, the icon blinks in the system tray. You can then double-click it to display the list of contacts. Select a contact in the list and click E-mail to send him/her an e-mail. Version 1.04 build 18.1 may include unspecified updates, enhancements, or bug fixes.