Better photo editing: The built-in Photos app (shown below) will have an updated interface, with some new editing tools and a better facial recognition system.Fullscreen split view for Mail: The Mail app will have a new full-screen split view, allowing you to see your inbox while composing a message.The new version of Safari will help you block this type of tracking to protect your privacy. Ad tracking protection: You may already know that many websites track your activity in order to deliver targeted ads.Mail app improvements: If you use the built-in Mail app for email, you'll be able to keep it open without slowing down other apps because the new version will use 35 percent less disk space.According to Apple, it will be able to run JavaScript 80 percent faster than before. Safari speed improvements: The built-in Safari web browser will be faster than previous versions.Rather, it will allow your computer to access files much more quickly, leading to a noticeable improvement when moving or copying files. This CPU upgrade should work just fine if you have Mac OS X 10.5.8 Leopard or newer installed (some revisions of Leopard came before the T9300/9500 CPUs were released, so let’s not run that risk). Because this is a back-end change, it won't change the way your files and folders are organized. After reassembling everything, the iMac chimes right away and has no issues booting up. File system: macOS High Sierra will use a new file system called Apple File System (APFS), which will replace the current Hierarchical File System Plus (HFS+).Most of the changes are designed to improve the speed and efficiency of your computer. The look and feel of High Sierra is very similar to Sierra.

You cannot purchase a physical copy at a retail store. As with previous versions, macOS High Sierra is only available as an online download.

Upgrade to mac 10.13