My university uses office 365 email. My primary office 365 email account is currently set up on Thunderbird. It was easy to set up and works fine. It has been for ~8 years. Recently we have started using what we call "organizational accounts" set up in office 365. These are accessible by multiple people and authenticate from the authorized users my primary email accounts. In fact in Outlook, I can simply set the organizational account up as a second mailbox. I would like to do this in Thunderbird. I have tried adding it as a second account, but Thunderbird appears to complain that I am using the same credentials for the second account. I am not sure if this is a problem with Thunderbird or with Office 365. I would love to continue using Thunderbird. Any ideas how to make this work?