Currently I have configured Live, Yahoo, Gmail and Facebook accounts to my windows phone 7.5 (Device is Lumia 710).
The weird problem is, In calendar, Only birthdays from Live, Google Mail and Yahoo mail is visible.
But I have all my friend's birthday in facbook account.
Note: I have checked settings of Phone calendar for 100 times. And also, I have selected the option for making visible the Facebook events on Windows calendar.
Any Idea? what might be the reason?