Microsoft announced exciting updates coming to the web version of Outlook in Office 365. As part of the ongoing work to deliver the richest email and calendar experiences on the web, Microsoft is rolling out an improved user interface (UI) and new features that help you be more efficient, stay on top of your inbox, and better manage your calendar. Formerly known as the Outlook Web App (or OWA for short), the browser-based Outlook experience will simply be referred to as “Outlook on the web” going forward.
Outlook on the web now sports a simplified, cleaner UI to help you work more efficiently. This starts with the new action bar available across our Mail, Calendar, People and Task experiences in Outlook on the web. The Action toolbar provides quick access to the most common commands, whether you are clearing out your inbox, replying to an email, or adding an event to your calendar.
Microsoft made a number of tweaks and improvements throughout the UI for a cleaner look. The email subject line is larger and more prominent, and messages in the reading pane are now indented for easier reading. In Calendar, more prominent buttons make creating a new meeting request straightforward and navigation of your calendar simpler.
You can now pin any message in your inbox to have it highlighted in yellow and kept at the top of your inbox. Pins are a terrific way to keep important messages handy and prevent them from getting buried in your inbox.
Sweep provides a simple set of actions to manage emails from specific senders. It is great for managing reoccurring messages like newsletters, digital coupons, and other email received on a regular basis. With Sweep, you can choose to keep messages from a specific sender for a specified number of days, only keep the latest message, or delete all messages from the sender. Other additions include improvements to Archive, Undo, single line view and the Immersive reading pane.
Outlook on the web now provides the ability to easily resize images, add custom borders, apply shadow effects, rotate images and more.
In addition to the traditional color-coding approach, Calendar now supports charms—icons you can apply to Calendar items as visual cues that help you quickly identify specific types of events.
Further improvements have been done on the mobile experience on the various platforms and enhanced feedback features.
( Source: https://blogs.office.com/2015/08/04/new-features-coming-to-outlook-on-the-web/)