OS X Mountain Lion (version 10.8) is the ninth major release of OS X (previously Mac OS X, now called macOS), Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so. Migration Assistant is a utility by Apple Inc. That transfers data, user accounts, computer settings and apps from one Macintosh computer to another computer, or from a full drive backup. As of OS X Lion and later, it can also migrate contacts, calendars, and email accounts and other files from Microsoft Windows. Migration Assistant can be used during initial setup of a new computer or run. How to download episodes on hulu on macbook pro.
Migration Assistant copies all of your files to your new Mac so that you don't have to copy your files manually.
If your files are currently on a Windows PC, follow the PC migration steps instead.
If your new Mac is using OS X Mountain Lion v10.8 or earlier, follow the Mountain Lion migration steps instead.
Check software, settings, and power
Install all available Apple software updates on both Mac computers. Install any updates for your third-party apps as well.
Make sure that your old Mac is using OS X Lion or later.
Make sure that your old Mac has a computer name: Choose Apple menu > System Preferences, then click Sharing and check the Computer Name field.
Connect both computers to AC power.
Connect the computers to each other
If both computers are using macOS Sierra or later, just make sure that they're near each other and have Wi-Fi turned on. If either is using OS X El Capitan or earlier, connect them to the same network using Wi-Fi or Ethernet.
Or connect them using target disk mode and the appropriate cable or adapter. Then start up your old computer in target disk mode.
Or connect your new Mac to a Time Machine backup of your old Mac.
Use Migration Assistant
On your new Mac:
Open Migration Assistant, which is in the Utilities folder of your Applications folder.
Click Continue.
When asked how you want to transfer your information, select the option to transfer from a Mac, Time Machine backup, or startup disk.
When asked how you want to transfer your information, select the option to transfer to another Mac.
Click Continue.
On your new Mac:
When asked to select a Mac, Time Machine backup, or other startup disk, click the appropriate icon.
Click Continue. You might see a security code.
On your old Mac: If you started your old Mac in target disk mode or are migrating from a Time Machine backup, skip these two steps.
If you see a security code, make sure that it's the same code as on your new Mac.
Click Continue.
On your new Mac:
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Choose the backup to transfer information from.
Click Continue.
Continuing on your new Mac:
Select the information to transfer from the backup.
Click Continue to start the transfer. If you have a lot of content, the transfer might take several hours to finish.
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In the example above, John Appleseed is a macOS user account. If you transfer an account that has the same name as an account on your new Mac, you're asked to rename the old account or replace the one on your new Mac. If you rename, the old account appears as a separate user on your new Mac, with a separate home folder and login. If you replace, the old account overwrites the account on your new Mac, including everything in its home folder.
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After Migration Assistant is done, log in to the migrated account on your new Mac to see its files. If you're not keeping your old Mac, learn what to do before you sell, give away, or trade in your old Mac.