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Mac OS X: How Do I Find Which Mac OS X Version Is on My Computer?

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Introduction

Learn how to find the Mac OS X version and build number on your computer. This information is helpful when you update the software or the operating system.
To find the Mac OS X version number, click the Apple () icon, and then click About This Mac. The About This Mac window opens, and displays the OS X version number.
Figure 1: An example of the Mac OS X version number displayed in the About This Mac window
Image: Mac OS X version number displayed in About This Mac window
In the example, the version is 10.7 (OS X Lion).
Follow these steps to view the build number for your Mac.
  1. Click the Apple () icon, and then click About This Mac. The About This Mac window opens.
  2. Click the word 'Version' to toggle through the version, build, and serial number information for your Mac.
    Figure 2: An example of the About This Mac window showing the location of the word 'Version'
    Image: An example of the About This Mac window showing the location of the word 'Version'
NOTE:You can also access the OS X version and build number from the System Information dialog box. In the About This Mac window, click More Info to open the System Information dialog box.
HP LaserJet Pro M1217nfw Multifunction Printer

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