Below are two screen shots from the Windows 10 mail and calendar app. All this white space and lack of information density really annoys me. I hate it in iOS too. Is it not possible to have a more 'modern' design without all this white space everywhere?
http://www.theverge.com/2015/4/4/8345881/windows-10-mail-calendar-apps
http://www.theverge.com/2015/4/4/8345881/windows-10-mail-calendar-apps