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If you have a busy life, and most of us do, your iPhone or iPad can be used to help you manage your schedule and day-to-day appointments, plus allow you to stay in contact with the people you know (and manage those contacts using the Contacts app), while also helping you maintain one or more detailed to-do lists.
Veteran iOS device users will immediately discover some nice improvements to the iOS 5 edition of the Calendar app, which now offers additional onscreen calendar views, plus the capability to view event-related attachments from directly within the app.