Hi sprasad3,
I am sorry to hear that you are bouncing between both tech support teams for this issue: "Yahoo allows linking mailboxes to have a unified inbox. This is not working with my cox.net account." I understand how frustrating this must be for you, but it sounds like the transition worked as intended and your emails are now on the Yahoo servers.
You'll need to confirm this with the Yahoo email support team, but it sounds like this is happening because you no longer have an email account on the Cox email servers for Yahoo to link with. It seems as if the Yahoo email servers don't see cox.net as a Yahoo account to link up with.
I appreciate your patience, thank you,
Mike
Cox Support Forums Moderator