Microsoft announced that Free version of Microsoft Word, Excel and PowerPoint would be added in Windows 10 OS for smartphones and small tablets (under 8 inches). These versions of Word, Excel and PowerPoint will be free versions of the core Office apps that were previously designed for touch screen.

Free Word, Excel & PowerPoint will be added in Windows 10 for Mobile

As Microsoft’s Joe Belfiore stated, Microsoft is working on extensive universal apps that can be installed in all Windows OS supported devices such as smartphones, tablet and PC. 
“Our Office team has been hard at work creating killer universal apps for Windows,” he said. The mobile apps “will deliver a highly rich and highly complete version of Office on these devices.”
As expected earlier, the apps will have a mobile version of the familiar (and once-controversial) Office Ribbon. “What we’ve done here is nicely format the familiar Ribbon experience right into the app bar experience,” Belfiore said.
There’s no doubt that this will be very useful for those who still need to use Office apps. But it’s also unlikely that including this feature will increase selling of Windows OS powered devices. Microsoft need to do much to compete against Android and iOS. It’s even still unclear whether it will attract people much than Android Lollipop 5 or iOS 8