Note:
Supported Web browsers for Outlook on the web in Exchange 2019 are Microsoft Edge, Internet Explorer 11, and the most recent versions of Mozilla Firefox, Google Chrome, and Apple Safari.
The former Outlook Web App user interface has been updated and optimized for tablets and smart phones, in addition to desktop and laptop computers. New Exchange 2019 features include:
Platform-specific experiences for phones for both iOS and Android.
Premium Android experience using Chrome on devices running Android version 4.2 or later.
Email improvements, including a new single-line view of the Inbox with an optimized reading pane, archiving, emojis, and the ability to undo mailbox actions like deleting a message or moving a message.
Contact linking the ability for users to add contacts from their LinkedIn accounts.
Calendar has an updated look and new features, including email reminders for Calendar events, ability to propose a new time in meeting invitations, improved search, and birthday calendars.
Search suggestions and refiners for an improved search experience that helps users find the information they want, faster. Search suggestions try to anticipate what the user's looking for and returns results that might be what the user is looking for. Search refiners will help a user more easily find the information they're looking for by providing contextually-aware filters. Filters might include date ranges, related senders, and so on.
New themes Thirteen new themes with graphic designs.
Options for individual mailboxes have been overhauled.
Link preview which enables users to paste a link into messages, and Outlook on the web automatically generates a rich preview to give recipients a peek into the contents of the destination. This works with video links as well.
Inline video player saves the user time by keeping them in the context of their conversations. An inline preview of a video automatically appears after inserting a video URL.
Pins and Flags which allow users to keep essential emails at the top of their inbox (Pins) and mark others for follow-up (Flags). Pins are now folder specific, great for anyone who uses folders to organize their email. Quickly find and manage flagged items with inbox filters or the new Task module, accessible from the app launcher.
Performance improvements in a number of areas across Outlook on the web, including creating calendar events, composing, loading messages in the reading pane, popouts, search, startup, and switching folders.
New Outlook on the web action pane that allows you to quickly click those actions you most commonly use such as New, Reply all, and Delete. A few new actions have been added as well including Archive, Sweep, and Undo.