On May 5, MobileMe — Apple’s US$99-per-year suite of Internet services — will transition completely to the new Calendar service that Apple launched in October. The new MobileMe Calendar includes calendar sharing, invitations, and a new Calendar web application.
To maintain calendar syncing between your devices and to continue accessing your calendar at me.com, MobileMe users must upgrade to the new Calendar by May 5. To do so:
1) Make sure you are using the most recent software on your devices and computers:
iPhone, iPad, and iPod touch: iOS 4.2.1 or later
Mac: Mac OS X 10.6.6 Snow Leopard or Mac OS X 10.5 Leopard (requires manual setup)
PC: MobileMe Control Panel version 1.6.5
2) Sign in to www.me.com/calendar and follow the dialog that appears or click “Upgrade now” in the sidebar.