Set up Mail in Mac OS X 10.9 and 10.10 (Mavericks and Yosemite)
How to set up your Exchange Online account in Apple's native Mail application, in Mac OS X 10.9 (Mavericks) and 10.10 (Yosemite). Note that there is also a set-up wizard to do this for you automatically – see the Email Set-up Wizards section (link at foot of this page).
Set up Apple Mail in Mac OS X 10.11 (El Capitain)
How to set up your Exchange Online account in Apple's native Mail application, in Mac OS X 10.11 (El Capitain). Note that there is also a set-up wizard available to do this for you – see the Email Set-up Wizards section (link at foot of this page).
Set up Apple Mail on an iOS 11.x device (iPad, iPhone)
Instructions for manually adding your Exchange Online account to an iOS device. Note that there is a set-up wizard available to do this for you automatically – see the Email Set-up Wizards section (link at foot of this page).
Set up Apple Mail on an iOS 10.x device (iPad, iPhone)
Instructions for manually adding your Exchange Online account to an iOS device. Note that there is a set-up wizard available to do this for you automatically – see the Email Set-up Wizards section (link at foot of this page).
Set up Outlook in Mac OS X and macOS
Note: these screenshots were taken in macOS 10.12 (Sierra) but the process is simiar in earlier versions of Mac OS X.