An update for the upcoming Microsoft Office 2019 sees the software will only be able to run on Windows 10.

The change was spotted on a Microsoft support post describing the new changes to Window and Office servicing and support.

In the post Microsoft defends its decision by saying, “Modern software not only provides new features to help people do their best work, but also new, more efficient manageability solutions and more comprehensive approaches to security. Software that is more than a decade old, and hasn’t benefited from this innovation, is difficult to secure and inherently less productive.”

The Verge points out this move is designed to push businesses who do not have Office 365 into subscriptions. This update will not affect Office for Mac.

Microsoft Office 2019 will be releasing during the second half of 2018, includes perpetual versions of the Office apps (including Word, Excel, PowerPoint, and Outlook, and Skype for Business) and servers (including Exchange, SharePoint, and Skype for Business).

Microsoft says previews of the new products will start shipping mid-year 2018.

In a post Microsoft says, ‘Office 2019 will add new user and IT capabilities for customers who aren’t yet ready for the cloud. For example, new and improved inking features—like pressure sensitivity, tilt effects, and ink replay—will allow you to work more naturally. New formulas and charts will make data analysis for Excel more powerful. Visual animation features—like Morph and Zoom—will add polish to PowerPoint presentations. Server enhancements will include updates to IT manageability, usability, voice, and security.’