Outlook for Opera is an Opera's Extension that makes Outlook.com better for Opera.
To download the wrapped up extension go to:
https://addons.opera.com/en/extensions/details/outlookcom-for-opera/

INSTALLATION

Opera users go here: https://addons.opera.com/it/extensions/details/outlookcom-for-opera/?display=en

Firefox users:
1) Install Greasemonkey: https://addons.mozilla.org/it/firefox/addon/greasemonkey/
2) go here: https://github.com/frankdd89/outlookForOpera/downloads

Chrome users:
1) Install Tampermonkey: https://chrome.google.com/webstore/search/Tampermonkey
2) go here: https://github.com/frankdd89/outlookForOpera/downloads