Are you using Yahoo Customer Care mail and Outlook both and you want that both the email application get configure in one so that it become easier for you to check your emails coming to both account. Well, you can do that easily. Both Outlook as well as Yahoo has the option that you can add another email ID in account so that you can receive the email of other on same. However, it is best to configure Yahoo mail account to Outlook. If you want to know the process as how you can do that, then call to Outlook technical team to have information about same.