This is coming in the new version of Outlook.com. If you don’t already see it, you should soon see “Reply all by meeting” in the drop-down menu next to “Reply” when you click on a specific email. Hope that fits your needs. Thanks for the feedback.
An error occurred while saving the commentDiane Poremsky commented
Stein: Reply all by meeting will open a meeting request - delete the attendees, change the time and date as needed then click send to add it to your calendar.
If you use Outlook desktop, you can drag messages to the Calendar module icon to create a new appointment with the message in the appointment body.