Internet Explorer 11 displays only the light version of Microsoft OWA
Using Internet Explorer 11 it is not possible to use OWA full but only the Light version, to overcome this problem you can enable Compatibility View in IE 11 for the OWA site by performing the following operations:
1) In IE 11, click on 'Tools' and select 'Compatibility View Settings'.
2) In the pop-up dialog, you will see the main domain hosting the OWA site.
3) Click on 'Add' and 'Close' and the login page will be automatically updated with the option Use Outlook Web App Light will be deselectable.
It is therefore necessary to set the compatibility mode in order to use OWA Full.
With the OWA Full version it will be possible to attach files.
