As you know, we have made a few changes to Webmail in January, and there is one more still to come:
Thursday, January 29th, 2016 - Composing a New Message
Composing a new message is one of the most popular actions in Webmail. We are making a change that will improve compose loading times by up to 300%. To achieve this, the compose window will now open as an embedded widget for all users each time they click the compose button. If the user wants to pop-out as a new window, they can click the arrow-icon in the upper right corner of the compose widget. Webmail will NOT remember this choice, and it will only apply to that individual email.