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I've had a Yahoo account setup and recently I keep getting an authentication error which I've included. I've deleted the account and re-added it with no luck and any clue how to eliminate. I do get emails from Yahoo into Outlook but the error pops up it seems every few minutes.
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Any other suggestions and since I've been running Outlook without the Yahoo account it has been more stable and the number of restarts is way down
Did that and there were some errors but not related to Yahoo IMAP. The other oddity is it works "sometimes" and not others and if there was a Keychain I assume it would be consistent.
Follow steps from here, Troubleshoot the Keychain
http://www.office.mvps.org/troubleshoot/keychain.html
Ensure you are entered correct settings for Yahoo account in Outlook.
To test this set up the Yahoo account as POP account to check how outlook behaves..