All registered students and teachers are allowed to use the software "Microsoft Office365 ProPlus” freely.
You can use Word, PowerPoint, Excel and OneNote at any time and on any device. With a 1 TB OneDrive storage You can use all online.
By registering with "Microsoft Office365 ProPlus" you get the option to download the software on up to 5 devices to install and use.
More information regarding the use and registration is available here (German).