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Thunderbird Failed to Connect to Exchange Server Error with Solutions

Admin | Modified: 2018-11-26T17:21:14+05:30 | 4 Minutes Reading
Thunderbird Failed to Connect to Exchange Server Error with Solutions

Hi, a couple of months ago I have hosted my email account with a domain in Thunderbird. I tried to synchronize my internet connection in this email program but, I encountered an error i.e., Thunderbird failed to connect to Exchange Server. Can anyone guide me on what am I suppose to do now?

Thunderbird Failed to Connect to Exchange Server

Most of the Thunderbird users face different errors while working on it. One such error is Thunderbird Failed to Connect to Exchange Server with ExQuilla. This kind of server error is not easy to understand for a normal user who a nontechnical person. Previously, it was difficult to fix this issue for a normal person. But, nowadays it can resolve by connecting Thunderbird with MS Exchange server. For establishing this connection, one needs to have an Add-on named as ExQuilla’s. This will help users in connecting with Thunderbird to Exchange server version 2010/2007. So, users have to install this addon by providing required server details. In the following section, we describe the method to install this Add-on with steps to setup Microsoft Exchange.


One need to have following things to successfully resolve Thunderbird denied to connect to Exchange server error:

  • Exchange email account of version 2010 or 2007
  • Mozilla Thunderbird installed and configured
  • Users must be having EWS i.e., Exchange Web Services

Get Solution to Thunderbird Failed to Connect to Exchange Server

By Using ExQuilla Add-on:

  • Open Mozilla Thunderbird email client application
  • Then move towards Tools
  • Next, go to Add-ons
  • Now, in the search field, type Exchange and then press ExQuilla addon
  • After that, press Install and Restart Mozilla Thunderbird
  • And this add-on must get installed
  • Now, configuring new Exchange Web Services

After doing this, if the problem persists then users must try to move from their outdated ExQuilla’s version which does not work properly. To perform this try to do by following steps:

  • Click and download new updated ExQuilla add-on to avoid Thunderbird Failed to Connect to Exchange Server Error
  • Open your Thunderbird email client
  • Move to Tools
  • After that to Add-ons
  • Then press the Tools drop-down
  • And now choose Install-from-File
  • Then navigate to where the file was saved
  • Select the desired path
  • And at last press the Install button
  • After that, you need to restart Mozilla Thunderbird again, by clicking “Restart-Now
  • After countdown, press Install

Know How to Setup Account?

To perform the setup at first user need to find the EWS address and then solve the issue Thunderbird Failed to Connect to Exchange Server. After this user must fill the window with genuine credential then do the following steps:

  • First, Move to Tools
  • After that ExQuilla for Exchange
  • Then, select Add-Microsoft-Exchange-Account
  • When 1st wizard’s window appears to provide email address as well as password
  • Give the option for “Login-with-Email-Address” checked
  • After that press Next
  • While email Authentication gets failed to move back and use the method of Domain \ Username
  • In the Microsoft Exchange address-setup-dialog, if its server has been configured for auto-discover, then you can press the switch for Do-Auto-Discover
  • Then after ExQuilla locates server address
  • However, if setup did not work for this auto discovery feature, then you have to manually enter your address
  • Then, press Manual key
  • And then provide URL to the server in the field of MS-Exchange-EWS-URL
  • Now, press Next
  • And then, provide your Name
  • Place both bottom checkboxes as checked
  • Pop-up window will list the created setup
  • Press Finish

Thunderbird Failed to Connect to Exchange Server: Automated Solution

Another best solution to this is to perform this without Thunderbird so the time that user spends on Thunderbird will be eliminated. To perform like this user have to Convert Thunderbird MBOX to PST.

MBOX Converter

Now import this obtained .pst files to Exchange Server with help of PST to Exchange Migration tool. This is really relevant if the users have Thunderbird email file on their local hard disk.

Exchange Import


The above content says the problem faced by the normal user that is Thunderbird Failed to Connect to Exchange Server. So here we have discussed the solution as by the manual procedures. The method used here is a wide process so the third party tool is discussed in the above automated solution. This works really fast to move MBOX files to Exchange without Thunderbird.