Editor's note: List of features updated on 1/18/19
Currently unsupported (Coming soon)
S/MIME - Reading pane and Compose
Flag date range support
Propose new time from meeting invite
Reminder to turn off out of office notification
Add and edit birthday calendar
Change weather location settings
Publish calendar settings
Admin policies via Set-OWAMailboxPolicy
Newly available (Since September 2018)
Open shared mailbox
Folder retention policies
Add someone else’s calendar
Multiple online meeting provider support
Conference room search
Change event time zone
End of edit.
On September 10th, when Targeted Release customers can opt-in to the early version of the new Outlook on the web, there will be some features that won't be available yet in that early version of the new experience.
If you need to use a feature that is not yet available you can opt-out of the early version and opt-in again later, as often as you want.
See below for features not yet available on September 10th.
1. Reading Pane and Mail Compose
No chat or call functionality integrated in your inbox
Edit "Send From" address
Policy tips - Policies will be respected and actioned but users will not see prevention tips.
2. Folders and Message List
Shared Folders - No ability to share individual folders across mailboxes.
Folder retention policies - No support for administrators being able to set how long emails are retained in certain folders. Ex: Changing how long emails stay in Junk email before being automatically deleted
Not able to add or remove time zones.
No Mailtips available in Calendar while reading/composing
No ability to propose a new time from the meeting invite
No email reminders
2. Calendar Surface:
No ability to open calendars from organization's directory (in classic experience known as: to add a calendar "From directory")
Public folders - No suppport to create a calendar in a public folder or manage/share it
No out of office (OOF) toast message that shows up in the form, if at least one of the attendees that you are trying to schedule for is OOF
No ability to publish calendars to an HTML link (that others can view) or an .ics endpoint (that others can subscribe to).
Weather settings - no ability to set your weather location(s)
No support for printing calendars
No keyboard shortcuts + accessibility
Public Folders – ability for multiple people in the company to access a given folder is not yet supported
We are working to bring these features soon but you can always use them by opting out of the early version of the new Outlook on the web.