One other question, if I drop Comcast, can I still use Xfinity email with my comcast.net address?
If you tell them you are taking a six month vacation...say to Colombia or Venezuela.... they might let you keep it because they want you to have an incentive to re-up and start giving them money again.
But this why I never use xfinity mail or ATT mail. I use gmail so I don't feel locked in. I play the field. Gmail is the best because you can do a great search in your mailbox. At least once per day I have to search it for an email with important information