This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
I have several outlook accounts, since yesterday none of them are working with Outlook.
In the account setup screen the Test Connection button works. Everything is fine.
However, when Mailbird tries to actually log in to get mail I get Server authentication failed.
I've tried deleted one of the less used accounts and adding it back in. This did not solve the problem.
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
Answer accepted by question author
i found this suggestion in a reddit post so i cant take credit,, but so far it has worked for me
changing the IMAP and SMTP servers to old MS versions:
imap-mail.outlook.com port 993
smtp-mail.outlook.com port 587 using STARTTLS
except i had to use ssl/tls toggle settings then mine would work
All Microsoft email accounts seem to have the same issue with Mailbird: Live, Hotmail, and Outlook. I use 8 different Microsoft accounts, and they do not work now with Mailbird. Mailbird support reports that is a Microsoft issue and not a Mailbird settings problem. All they do is blame Mailbird, which worked just fine in the last 7 years with all Microsoft accounts, and now, suddenly, all Mailbird users cannot use their Microsoft accounts.
You have to understand that people like me, who actively use several Microsoft accounts (I use 8), cannot open a different browser for every email account, to read and reply to emails.
By the way, I use paid Microsoft email accounts, which is even more annoying.
I did try everything you suggested, but nothing worked.
There is a real fix for that?
The same thing happened to me. I changed the settings, 10 minutes later the problem had returned.
I installed Thunderbird. It gives a better error message.
It seems that someone hasn''t updated the security tokens on the servers.
I am getting the same problem that I cannot authenticate my outlook.com email address in Mailbird client. I have removed and added, checked all settings but nothing was changed on my end. Mailbird support stated they are getting many calls with Outlook emails not authenticating. They stated it is an Outlook issue and to contact Microsoft.
