How do I... Add my existing Gmail account to Windows Mail?

Now, select the Advanced tab. At this point, select both of the This Server Requires A Secure Connection (SSL) check boxes first, then type 465 in the Outgoing Mail (SMTP) text box and 993 in the Incoming Mail (IMAP) text box, as shown in Figure H. (Keep in mind that if you type numbers in the text boxes before you select the check boxes, the numbers may revert to the default values, which will cause connection problems.)