Are you saying you have a new email account and need to set it up in Thunderbird? If so, click File>New>Existing email account and fill in the next pane to get started. If you need more assistance, please provide more info. Thank you.

Thank you for your reply. I had to change my Bband provider as it closed down. I went to outlook.com. I couldn't send emails through Thunderbird as it didn't recognise it. I have had to change my default server to Mail. not sure this has solved the problem

If you created a free email account at outlook.com, you can set it up in thunderbird. input: office.office365.com, port 993, Oauth2, SSL/TLS output: office.outlool365.com, port 587, normal password, STARTTLS

David, thank you again. I shall try to set up with Th/ bird as you suggested. Many thanks from Glenys

Glenys, here is update: if the output setting doesn't work use this: smtp.office365.com, port 587, STARTTLS, authorization set to OAUTH2,