Hi Jim Conway
To add your Yahoo Mail account to Outlook Classic, open Outlook, go to File > Add Account, enter your Yahoo email, sign in with your Yahoo credentials (including two-factor authentication if enabled), grant permissions, and select Done. Your Yahoo Mail will then appear in Outlook. For detailed steps, you can refer to the official Microsoft documentation here:
You can refer to the official Microsoft documentation for detailed guidance below:
Add or manage a Yahoo! email account in Outlook - Microsoft Support
I hope this information helps. If you have any further questions, please feel free to ask in the comment section.
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