Set an Email Reminder for an Event
Follow these steps to add an automatic email reminder to an event in your Outlook.com calendar.
Log into your Outlook.com account, and select the Calendar icon at the bottom of the left-hand menu.
You can also reach your Outlook.com calendar by selecting the Office applications launcher in the upper left of the Outlook.com page and choosing Calendar.
Select the calendar event you want to add an email reminder to, and press Edit.
Select More options in the calendar event edit window.
Open the Remind me dropdown, and select Add email reminder.
In the Email reminder window, choose Add email reminder.
Open the Remind me dropdown, and choose when you want an email reminder to be sent for this event.
You may also add a reminder message in the email sent by entering it in the text box labeled Enter a reminder message here (optional).
If you would like an email reminder to also be sent to invitees of this event, check the box next to Send to attendees.
You'll only see this option if there are already attendees. If there aren't, add those first and then return to this step to check that box.
Press Save. Now you and your guests will receive an email reminder.