Another user had a question about Outlook on the web:
In Outlook on my desktop, I can drag the message to the Calendar to create a new appointment that contains the text of the email. After I create a new appointment, I can select "Insert Item" to insert the contents of a mail message. I haven't found a way to do the same thing using Outlook on the web. Is there a way to do it?
No, unfortunately, there isn’t an a way to do this in Outlook on the web. You’ll need to select the message body, copy then paste into the appointment body.
If you're sending a meeting request, you can do that from the message in Outlook on the web . Expand the Reply button, choose Reply by meeting to create a meeting to all recipients. (Unlike in Outlook desktop, you can't cancel the meeting and turn it into an appointment.)
Add or remove recipients to the meeting request. (If you are presented with a dialog to Send or Edit, choose Edit to make the changes before sending.)
Note: At this time the "beta" version of Outlook.com does not offer Reply with Meeting. It's unknown at the time of this writing if this will change or if the feature will be removed from future versions of Outlook on the web.
TIP: Outlook desktop has the same feature, it's triggered by the Meeting button on the ribbon.
See the following macros to create appointments or tasks from incoming email in Outlook desktop (on Windows OS)
"Create an Outlook Appointment from a Message" (uses entire message body)
"Create Task or Appointment and Insert Selected Text" (pasts selected text into appointment or task body)