ClassBook Prieview is a free app for working with data from a personal Office 365 account.
After starting an Office 365 user has to login with his email address and his password.
The app uses this account directly against the Office 365 service and displays all files from the OneDrive for Business, Calendar items and E-Mails for that user.
You can easily upload new files and set new calendar entries.
Since the Office 365 interface is in a preview status this app also is a preview version!
You can download ClassBook for free in the Windows 8 Store.