Let’s start with the Outlook.com inbox:
You’ll notice a box next to each message.
Once you check the messages you wish to delete, you’ll get the option to Delete, Archive, Junk or Move at the top of the page.
Now if you’re using the Outlook e-mail client, it will look a little different.
Select the e-mail you wish to delete with your cursor.
You
can select multiple e-mails either by pressing the Ctrl key to choose
them one at a time or by pressing Shift to select a range of messages
Press the Delete key to delete your selection of messages.