At the end of last year, Microsoft made all apps in its suite Office for iOS compatible with iPhones / iPods touch and free even for editing files. However, this breast will not apply to the iPad Pro.
As explained by the Ars Technica, Microsoft only allows free use of the support on “really mobile devices” and therefore has determined a maximum screen size in 10.1 inch. The iPad Air is within that, as its screen is 9.7 inches; the iPad Pro, with its 12.9 inches, no.
We still don't know exactly how it works in practice (there is still time before the iPad Pro hits the market in November), but iPad Pro owners will certainly have to pay for their Office 365 subscription to work on Word, Excel, PowerPoint and / or OneNote on your tablets.
Here in Brazil Office 365 Personal costs R $ 209 / year (or R $ 21 / month), while Office 365 Home costs R $ 259 / year (or R $ 26 / month).