Well this is a bad suggestion. Trying this still results in the 1.1.500 error, and letting AquaMail default to "Outlook/Hotmail/Live" for the setup results in adding the account as IMAP, which we all could have done from the beginning, if that's what we wanted, but we don't.
IMAP is unacceptable because it does not support calendar. We need the proper fix to the email issue itself.
A new installation of Nine works fine, so clearly this is still possible with third party email apps, but this does not work with AquaMail any longer. Please fix this issue properly.