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Renamed options: Internet Accounts
There are also some minor changes and tweaks to the operating system. "Mail, Contacts & Calendars" has been renamed to "Internet Accounts." It is now designed to bring together your contacts, mail, events, and other data from your various accounts, such as Facebook and Twitter, among others, and compliment existing iCloud and OS X data.
Internet Accounts: LinkedIn, Exchange 2013
Internet accounts supported now include Exchange 2013 (with updated iconography) and LinkedIn, among other existing services, like Facebook and Twitter.
Enabling iPhone, iPad device trust
Your Mac machine now requires that a trust relationship be built between your desktop or laptop, and your iOS-powered devices, such as your iPhone or iPad, before it is synced with iTunes or other desktop apps.