Thanks to the powerful technology that our Zimbra team built, and our involvement with the online calendaring community, we’ve been able to add some much-improved technical functionality to the new Yahoo! Calendar. Now you can better connect with your friends and family –- even those who aren’t using Yahoo! Calendar. Our new calendar is interoperable with the other popular services, including those from Apple, Microsoft, AOL, Mozilla, and Google, so you can share your upcoming plans and important dates with friends.