Originally Posted by
superq7
Yes thanks mixture I've tried that but no luck, looks like I'll have to pop over to the Genius Bar.
Is there anything of interest in Applications -> Utilities -> Console that mentions yahoo ?
UPDATE :
I assume you've exhausted the following possibility :
"This is due to a change in Yahoo security settings. You have to go into your Yahoo account and create a special App Password, then use that password in Calendar and Contacts to access your account."