There will be times that users (especially users who do not have an O365 mailbox) might need to access a Departmental/Shared email account directly via the web. Also, at this time, users without their own mailbox will only be able to access Departmental/Shared accounts via Outlook on the web.
The URL to use for login would be: https://outlook.office365.com/OWA/RaAccountSMTP/#path=/mail
You can use the Outlook for the web to publish your calendar so that others outside of your organization can see when you are busy. Create URLs that will allow people outside your organization to view your calendar online. One URL lets the recipient subscribe to your calendar by using Outlook or Outlook for the web, and the other lets the recipient view your calendar in a web browser. You...
The Mobile devices tab lets you view all the devices that you’re currently using to synchronize with your mailbox. If you’re using a POP or IMAP email program to synchronize your email, that will also appear in the list.
You don’t use Outlook Web App to specify the devices you want to synchronize with your mailbox. Instead, devices that you connect to your mailbox are displayed as connected devices within Outlook Web App after you’ve created a connection to your mailbox.