I was connected to O365 with my work email but cannot send any message. IMAP works just fine, all folders synced regularly, but sending not work for some unknown reason.
As popular and widely used as Microsoft Exchange is, it cannot be accessed through an email client such as Mozilla Thunderbird. Or at least that was the case not too long ago. Now, thanks to a little Thunderbird add-on by R Kent James dubbed ExQuilla, Thunderbird can be connected to Microsoft Exchange 2007 and 2010 servers through Exchange Web. Thunderbird can sync email with Exchange through IMAP, assuming IMAP is enabled on the server. Thunderbird does not natively sync contacts or calendar with Exchange. Over the years add-ons have been released that use the Exchange Web Services (EWS) interface for these categories of data. Install the TB Sync plugin and Provider for Exchange ActiveSync; Depending on the operating system you use, find the menu option Synchronization Settings (TBSync) Choose Account Actions, Add New Account, Exchange Activesync; Choose Office 365. Enter a descriptive name (for example, “Argonne”) and your @anl.gov email address.


Applied river morphology rosgen 1996. SMTP setting is as follow:smtp.office365.comport 587STARTTLSOAuth (this is correct setting, all others shows errors, including outlook.partner.cn & smtp.office365.cn, which is completely normal since I'm not in China).

Thunderbird Exchange Activesync E Mail

The first thing that jump out is that my password is not OK, which is not correct. Password is OK. Click on 'Retry' or 'Enter new password' do nothing, just return the same pop up. If 'Cancel', then receiving message with 'unknown error 80004005' and all other blablabla about unknown reasons, with instruction to check my SMTP settings.
I've tried all variations available, but nothing works. Sometimes, at some moment after click on Cancel, it said 'Message sent' and I can see it in my Sent Items folder, but it's fake because I never receive that test message to my personal Gmail address.
Add Exchange Account To Thunderbird
I have already tried all suggestions I could find (deleting passwords, resetting all, restarting, deleting and adding account again, changes in Config editor related to security.tls), but nothing worked for me.
My OS: Win 10 Pro, build 2004, TB version 78.3.2
Thunderbird Exchange Server
Any advise is very welcome. Thank you all in advance.

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