MobileMe's new calendar mandatory for all users by May 5

MobileMe users were notified today that all users will be upgraded to the new calendar service on May 5. The new MobileMe calendar includes calendar sharing, invitations and an upgraded web app. Those who want to upgrade right away are urged to have the latest software updates and back up their existing calendars before performing the upgrade, which can be done on MobileMe's calendar page. Those looking for more help can check out the support page.

The new calendar web app entered beta on July 7, 2010 and exited beta on October 14.