Not sure if this has been noted before, but Outlook 2016 (15.12.3) now has fully working and functioning Full Screen support when running in El Capitan.
The same version running under Yosemite does not support this function.
it does not work properly, i think this is more the window class i assume in El Capitan that has been enabled. For instance the search box freezes, there is no ability to search using the box on the top right, if you go full screen.
Not sure if this has been noted before, but Outlook 2016 (15.12.3) now has fully working and functioning Full Screen support when running in El Capitan.
The same version running under Yosemite does not support this function.