How can I change my mail from outlook to yahoo?

I have had a change in my cpu for some reason. I used to click a name and the mail would automatically go to yahoo server but now something has changed to outlook.How can I change my mail from outlook to yahoo?Click on Tools (at top) and then Internet Options. At top, click on Programs. Look for EMail and you should see Outlook. Click on that dropdown arrow and see if Yahoo is there. Click on it. Then Apply and OK.

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