Windows 8 Setup Comcast IMAP with Win 8 Mail App Posted December 11, 2012December 11, 2012 barb Comcast now has IMAP in public beta via a signup form. 1. Go to https://xcbetasignup.comcast.net/imap_trial/web/ and sign up. Wait for Confirmation. 2. The settings you need to configure Comcast IMAP, ports and protocols are shown below.