Hi, I have several Outlook email addresses, a Gmail, a Plusnet and the email address for my website "ellicombe.co.uk". They are all run from Thunderbird and on openning Thunderbird all email addresses signed on automatically. From about a week ago all the Outlook addresses failed to sign on and I receive the message "Login to server outlook.office365.com with username xxxxxxxxx@outlook.com failed." and the option to "Retry", "Enter New Password" or "Cancel". Repeated clicking on "Retry" will provide access but If I try to open a different mail folder (Sent, Template, Archive etc) I am asked to Sign on all over again! All non-Outlook sign on perfectly! This problem occurs when I try to access emails from my laptop or desktop both running Windows 10 and Thunderbird, or my Android mobile with K9. One of the affected email addresses is used by wife from her seperate account on the desktop via Thunderbird and is the only email address installed there. It works correctly Cheers, Graham.