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Changes to OAuth authentication for Microsoft 365 (formerly Office 365; often abbreviated as “o365”) business and academic hosted email accounts and services.

Microsoft has made some changes to authentication for their hosted email services for business and academic accounts. This article describes these changes and how to adjust to them. As of January 2024, this information is still evolving and subject to change. == Changes to Authentication == Microsoft has instituted the following changes : * [https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online Deprecated basic authentication] (username/password), and is instead now requiring OAuth authentication. * In some cases, SMTP authentication has been completely disabled. For new accounts, SMTP always starts disabled. In addition, there are some restrictions on SMTP that are not currently understood. Microsoft have also changed the way they classify certain clients, and Thunderbird’s previous OAuth setup does not properly qualify as a desktop client. As a result, we have been forced to make configuration changes to Thunderbird, which may have side effects for users. == Changes or Problems You May Encounter == For outlook.com, hotmail.com, Microsoft 365 (formerly known as Office 365 and often abbreviated as “o365”) or other Microsoft-hosted email services, you may see the following issues: # Your Outlook or Hotmail password no longer works with Thunderbird and you cannot send or receive email. #* Solution: Change ''Authentication method'' to ''OAuth2'' from ''Normal Password'' for both ''IMAP'' (or ''POP'') and ''SMTP''. #* IMAP (or POP): Click {menu ≡} > {menu Account Settings} > On the left side, click {button Server Settings} for your outlook.com or hotmail.com account > select ''Authentication method:'' {menu OAuth2} (instead of ''Normal password''). #*; [[Image:tb115-server-settings]] #* SMTP: Click {menu ≡} > {menu Account Settings} > On the left side, click on your outlook.com or hotmail.com account ''e.g. thunderbirdrocks@hotmail.com'' > {button Edit SMTP server…} > select ''Authentication method:'' {menu OAuth2} (instead of ''Normal password'') > {button OK}. #*; [[Image:tb115-smtp-settings]] # A screen that indicates IT administrator approval is required for the app. You must ask your administrator to authorize Thunderbird - approval must be done, but only once. Per Microsoft documentation, administrators should visit "https://login.microsoftonline.com/{tenant-id}/adminconsent?client_id=9e5f94bc-e8a4-4e73-b8be-63364c29d753" and grant the following permissions in order to authorize Mozilla Thunderbird: “IMAP.AccessAsUser.All”, “POP.AccessAsUser.All”, “SMTP.Send” and “offline_access” # An account worked on Thunderbird 102.6.1, but does not work on 102.7.1 or later. #* Please try signing in with a new Thunderbird profile (see [[profile manager create and remove thunderbird profiles]] for instructions on how to create a new profile). If a new Thunderbird profile works, then for most people it is best to continue using the new profile. '''More technical folks with other config editor changes''': Use the Thunderbird profile manager to switch back to the old Thunderbird profile and use the config editor (see [[Config Editor]]) to filter for "oauth2", find the appropriate server(s), and delete the entries for "oauth2.issuer" and "auth2.scope" #* Otherwise, [https://support.mozilla.org/questions/new/thunderbird/form ask for support]. # IMAP/POP3 work, but SMTP does not work: #* If you have an Microsoft 365 business account, ensure that SMTP Authentication is enabled or ask your IT administrator to check and turn it on if disabled. Microsoft has some instructions in their article: [https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission Enable or disable authenticated client SMTP submission (SMTP AUTH) in Exchange Online] #* If you have a Microsoft 365/hotmail/etc '''personal''' account, use basic authentication ([https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040 Microsoft’s guide] on how to change this). # Calendar does not work. #* Thunderbird does not support Exchange calendars. If you are using an add-on or other software to enable calendar, then you will need to seek support from the author of that add-on or software. == Where to Get Help == If you are a user within a business or academic institution that provides Microsoft accounts, you should seek assistance within your organization. If you have a personal account through one of Microsoft's hosted services, [https://support.mozilla.org/questions/new/thunderbird/form ask for support].