1. On your Outlook.com, check the Junk folder.
2. Make sure you did not accidentally put your Comcast account to Block Sender list.
Open Outlook.com > top right click, next to your name, click the Gear icon > select More Mail settings > under Prevent Junk email, click Safe and Blocked senders > click open Blocked senders and see if Comcast address is on the list > if yes > click it > at the middle, click Remove from list.
3. Make sure you did not keep all incoming mails in Inbox folder. Inbox folder is not meant to store emails.