Comcast is migrating Xfinity residential email accounts to Yahoo Mail, a shift that underscores how ISPs are offloading non-core applications to specialized providers. Comcast is transitioning existing Xfinity email mailboxes to be hosted by Yahoo Mail while allowing customers to keep their current @comcast.net or @xfinity.com email addresses. The migration is being phased, with customers notified by Comcast when their account is eligible and given guidance to complete setup. After migration, users access their mailbox through Yahoos web and mobile clients or supported third-party email apps. Mail, folders, contacts, and calendar data are moved as part of the process, with Comcast publishing specific steps and FAQs on support pages to reduce friction.