The macOS Sierra 10.12.2 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. 

This update:- Improves setup and reliability of Auto Unlock- Allows addition of a Chinese Trackpad Handwriting button to the Touch Bar Control Strip- Adds support for taking screenshots of the Touch Bar using the Grab app or Cmd-Shift-6 shortcut- Fixes an issue that caused the Touch Bar emoji picker to appear on the display- Resolves graphics issues on MacBook Pro (October 2016) computers- Fixes an issue where System Integrity Protection was disabled on some MacBook Pro (October 2016) computers- Improves setup and opt-out experience for iCloud Desktop and Documents- Fixes an issue with the delivery of Optimized Storage alerts- Improves audio quality when using Siri and FaceTime with Bluetooth headphones- Improves the stability of Photos when creating and ordering books- Fixes an issue where incoming Mail messages did not appear when using a Microsoft Exchange account- Fixes an issue that prevented installation of Safari Extensions downloaded outside the Safari Extensions Gallery- Adds support for new installations of Windows 8 and Windows 7 using Boot Camp on supported Macs 
For more detailed information about this update, please visit: https://support.apple.com/kb/HT207307 

For detailed information about the security content of this update, please visit: https://support.apple.com/kb/HT201222

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