Apple presented their new MacOS Sierra. He is compatible with the following Mac (complete macOS Sierra supported devices):
• iMac (late 2009 or newer)
• MacBook Air (2010 or newer)
• MacBook Pro (2010 or newer
• Mac mini (2010 or newer)
• MacBook (2009 or newer)
• Mac Pro (2010 or newer)
MacOS Sierra includes Messages app which replaces iChat and allows you to send messages, high-quality pictures and videos from your PC to another Mac or a device running iOS. Messages function will continue to support the protocols AIM, Jabber, Yahoo! Messenger and Google Talk. Applications Reminders and Notes help you create and track lists on Apple devices.
MacOS Sierra beta 1 is a property development on Apple portal. Download the update, you can also see the directory Mac App Store settings. To be able to download the public beta of MacOS Sierra, enough to pass short registration on the website. Release of the final version of MacOS Sierra is expected in September/October.