centaurianz: In my experience - I do expect that the mail client settings will most likely change if I'm changing mail server or provider. In this case, the service has been moved to Yahoo!
The POP and SMTP settings were clearly stated at the end of the sign-up process for Yahoo!Xtra Bubble.
I would expect nothing to change. FWIW Xtra is still the provider, and a lot of people know nothing about changing program configuration for e-mail servers, even though it was listed at the end.