Baboon: Ummm... I just enabled the birthdays calendar (in Settings->Calendar->View, scroll to the bottom) and it populated itself *shrug*
I've noticed it can take anywhere from seconds to minutes to populate with my contact's birthdays.
I didn't know there was a way to have them show up elsewhere.
Hmm I had to delete it and turn it on there again and now it's working. :)
But it's also adding a day to the birthday in the calendar!
It is showing the correct date in the birthdays calendar in my Outlook for Windows and also on my iphone, it's only the Outlook web app calendar that is wrong.I'll log a fault with Microsoft as well.