When you connect your accounts, you’ll have easy access to many of your 1st-degree LinkedIn connections in Outlook on the web. For example, you can send email messages to LinkedIn connections without visiting their profile or looking up their email addresses.
Important: This feature is only available in the new Outlook on the web. It is not available in classic Outlook on the web.
In Outlook on the web, create a new message and start typing a name in the "To" field.
If you have any LinkedIn connections that match the name you typed, they may display in the list of suggestions. You’ll see the LinkedIn logo next to suggested LinkedIn contacts. LinkedIn connections that have chosen to hide their email address from their LinkedIn network will not show up as suggested LinkedIn contacts.