Problems accessing office365 email servers via IPv6 + workaround. Volko wrote (I've translated the comment): emailed me and also addressed the Thunderbird Exchange Online login issue. Reader report #2: Thunderbird fails with oAuth2 Theo referred to the Microsoft Answers forum post Thunderbird IMAP responded: User is authenticated but not connected, where the topic is discussed.

This advice to disable IPv6 brought success.

The tenant admin says the license is active and IMAP is allowed.īlog reader Theo gave the advice to switch to oAuth2 after all and if there were problems, try the flag: Since the day before yesterday the IMAP access with Thunderbird to a MS365 account is not working.Įrror message: User is authenticated but not connected. Within my German blog reader Klaus left the following comment, reporting issues with Thunderbird IMAP connection since the end of 2022 (I've translated the comment). Reader report #1: Thunderbird fails with oAuth2 The issue was brought to my attention by two readers. However, there is the problem that the IMAP connection to Exchange Online via oAuth2 in Thunderbird is on strike. IMAP connection goes on strike in Thunderbird This means that all clients that want to access Exchange Online mailboxes via IMAP will have to switch to oAuth2 (Modern Authentication). The account name is something you can choose yourself, the e-mail is the address belonging to the account you want to add.In the article Reminder: Basic Authentication in Exchange Online will be switches off in 2023, I pointed out that Microsoft will finally switch off Basic Authentication in Exchange Online at the turn of the year 2022/2023. E-mailĪdd the following add-ons to thunderbird:Īfter installation select in the Thunderbird menu, Add-ons.įrom the drop-down menu Account actions select Add new account and select Exchange ActiveSync. For calendering however we have to rely on a Add-on written for Thunderbird. For the e-mail part we can use the standard IMAP and SMTP protocols. This document describes how to integrate the Open Source e-mail and calendering application Thunderbird with the Office365 product. Microsoft uses a lot of propriatary protocols in their products, which makes it sometimes hard to work together in projects. © 2020 Dennis Leeuw dleeuw at made-it dot com Office 365 and Thunderbird Office 365 and Thunderbird

Smtp office 365 thunderbird