If you are a forgetful person and you always end up forgetting when all your friends' birthdays are, then what you need is Noeld Birthday Reminder.
It is a simple reminder agenda where you are notified of all the birthdays of the day, as well as the most important anniversaries. It can also be programmed to notify you a few days in advance in case you would like to buy a gift in advance.
From the same interface of Noeld Birthday Reminder you can send a congratulatory email to the email of the person who turns years old. It also works very discreetly hidden in the Windows taskbar.
You can free download Noeld Birthday Reminder 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.