Yahoo! Calendar, one of the company’s early “Web 1.0″ properties, is getting a major facelift for the first time in 10 years. Yahoo announced details of the new Yahoo! Calendar beta today, which uses technology from their 2007 purchase of Zimbra. In addition to improving integration with Yahoo! Mail, the new calendar will be more compatible with other online calendar services (such as Google, Apple, and Microsoft) to let you share events with friends. It will also offer email, instant message, or SMS reminders of important events, and user-friendly functions like drag-and-drop rescheduling of events. As TechCrunch points out, most of these features only give Yahoo! Calendar to the same feature set as other online calendar services.

John Kremer, VP of Yahoo Mail, says future plans include integration with other Yahoo properties such as Flickr and Upcoming.org, as well as auto-synching with Microsoft Outlook and Apple’s iPhone. Yahoo has published a video demonstration of the new calendar service.

Yahoo is accepting sign-ups for the beta version of their new calendar at http://switch.calendar.yahoo.com/.

There’s more coverage on Techmeme.