Have you noticed any problems with Windows Live Calendar, with Birthday Calendars in particular? They should be fixed now, the team posted the following message:

We've just finished updating Live Calendar to fix up some of the problematic parts of Birthday calendars - so they should be up and running now!  We've also fixed a couple other bugs, and we're excited to have updated.

Steve Boots notified me of one of these other bugs, namely that there used to be an Invite button on an event addition/edit on a Group calendar. Clicking it would cause a failure since it didn’t belong there. Thanks Steve :)

Have you noticed any of these other bugs that got fixed? Let us know in the comments.