For general Office 365 Installation instructions, follow these steps.
Otherwise, see the Office 365 Device-Specific Installation Instructions below.
Office for Android™ can be installed on tablets and phones that meet the following criteria: running Android KitKat 4.4 or later version and have an ARM-based or Intel x86 processor. https://support.office.com/en-us/article/Install-and-set-up-Office-on-an-Android-with-Office-365-cafe9d6f-8b0c-4b03-b20a-12438a82a22d?ui=en-US&rs=en-US&ad=US
iPhone or iPad
Office for iPad® and iPhone® requires iOS 8.0 or higher. Office for iPad Pro® requires iOS 9.0 or higher. https://support.office.com/en-us/article/Install-and-set-up-Office-on-an-iPhone-or-iPad-with-Office-365-9df6d10c-7281-4671-8666-6ca8e339b628?ui=en-US&rs=en-US&ad=US%20
Mac OS X