Let's say you've just sent an email message to someone by mistake in Outlook.com. How do you recall it?
Unfortunately, you can't.
Message recall is not available for users with email addresses ending in @outlook.com, @hotmail.com, @live.com, or @msn.com. These are web-based email services where once you send an email message, it's gone from your email server and out of your control.
Message recall is available in Outlook 2016. See Recall or replace an email message that you sent for instructions.
Undo sending in Outlook.com
Note: Undo send isn't currently available in the Outlook.com beta.
Although you can't recall a message once it's been sent, when you turn on the undo send option, Outlook.com delays sending the message so you can cancel it if you change your mind.
You can delay sending your message for 5, 10, 15, or 30 seconds. To turn on the undo send option:
At the top of the page, select Settings > Options > Undo send.
Select Let me cancel messages I've sent for and choose the delay time from the drop-down menu.