Upgrade of OS X El Capitan ver 10.11.6
Hi, have a MacBook (Retina, 12-inch, Early 2015) with OS X El Capitan ver 10.11.6 (15G22010) and would like to upgrade the OS to use Office 365 apps. when searching for upgrades it mentions that "none are available". Is this possible or what am I missing?
MacBook, OS X 10.11