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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.
Approving trust on the iPhone, iPad
Once the Mac sends the message, it asks that the iPhone or iPad user accept the "trust" relationship. This method of two-factor authentication requires a device is "paired" to a Mac, and prevents data from synchronizing to the wrong device.