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Summary: Mozilla Thunderbird is a feature-rich, free desktop email application known for its user-friendly interface and security. Users facing message deletion issues can fix them by creating a new Trash folder. If problems persist, switching to an alternative email client like Outlook is suggested. Kernel for MBOX to PST Tool can aid in migrating emails.

Mozilla Thunderbird distinguishes itself with its numerous exceptional features and swift performance, setting it apart from its counterparts. With its user-friendly interface, robust security measures, and a multitude of other capabilities, Thunderbird stands as a formidable desktop-based email application. Thunderbird provides users with full control and extensive ownership over their email messages. Additionally, Thunderbird offers a plethora of available add-ons, allowing users to tailor and elevate their email experience to their liking. Furthermore, the best part is that Mozilla Thunderbird is available for free, enabling users to download, install, and utilize its capabilities without incurring any costs. Various versions of the application are compatible with Windows, Mac, and Linux platforms, ensuring accessibility to a wide range of users.

What is the Cannot Delete Message Error in Thunderbird?

A frequent problem encountered by users when using Thunderbird on their system is the inability to delete messages. If you find yourself unable to delete messages in Thunderbird, it could be attributed to a corrupted Trash folder. This issue can be quite frustrating and should be addressed promptly. Additionally, there are instances where Thunderbird might become unresponsive when attempting to delete messages.

What is the reason that causes Thunderbird can’t delete messages error?

Upon conducting research, I unearthed the prevailing reasons, which can be summarized as follows:

  • Should the file become compromised or corrupted, Thunderbird will be unable to execute these modifications, resulting in the failure to delete a message.
  • The issue arises when a mailbox is imported into an outdated version of Thunderbird or when Thunderbird has not been updated for an extended period.
  • Should the Trash folder become corrupted due to any unforeseen circumstances, it could potentially hinder Thunderbird’s ability to delete messages.
How to Fix Cannot Delete Messages in Thunderbird Issue?

Creating a new Trash folder after deleting the corrupted one offers a straightforward solution to address the issue effectively. To resolve the problem, it is recommended to follow these steps:

  • Click the “Menu” button. Then select “Help” and click “Troubleshooting Information.”
  • Select the “Open Folder” option within the Application Basics section, and then proceed to close the Thunderbird application.
  • Navigate to your File Manager and access the Mail folder corresponding to your impacted account type, whether it’s POP or IMAP.
  • Now open the folder with an incoming mail server name like or
  • Choose the Trash.msf and Trash files for deletion. In certain accounts, these files may also go by the names “Deleted” or “Bin.”
  • Restart the Thunderbird app on your system.
  • With the trash folder refreshed, deleting your email messages will now be a breeze.

What if the proposed solution doesn’t prove effective? In such a scenario, there’s a superior alternative: transitioning from Thunderbird to a different email client. The next question that arises is, how do we go about making this switch?

How to switch from Thunderbird to another email client?

Dealing with the inability to delete messages in Thunderbird can be rather vexing, but there’s a silver lining in the form of a relatively straightforward solution. Yet, what if this issue persists, forcing you to repeat the same steps repeatedly? Consequently, some users have opted to abandon Thunderbird and switch to alternatives like Outlook or other email clients. You might want to explore this alternative as a means to permanently and definitively address the “Can’t delete messages in Thunderbird” predicament. And if you do, we encourage you to try Kernel for MBOX to PST Tool which will help you to migrate multiple MBOX files simultaneously with the option to add single or multiple MBOX file(s) for conversion.

This software comes with advanced filtering options provided in the MBOX to Outlook PST tool, perform apple mail to MS Outlook migration and also allowing users to perform selective migration of MBOX mailbox items. Individuals have the option to refine their email item selection based on various criteria such as recipient, sender, subject, date, and attached files.

This software facilitates a seamless transition for MBOX files generated in any of the 20 distinct email clients, including but not limited to Apple Mail, Entourage, Eudora, Postbox, Netscape, PocoMail, Thunderbird, Spicebird, and many others.


Such errors as we discussed above may disturb the functionality and performance of the application. Therefore to get rid of such mistakes, one can use an alternate email client such as MS Outlook. And we all know Outlook does not support the Thunderbird MBOX file format. So, to move data from Thunderbird to Outlook, you need to convert MBOX file to PST file format. So we are here to recommend you the best MBOX to Outlook PST software which helps to convert MBOX files of various email clients such as Apple Mail, SeaMonkey, Entourage, Eudora, Mozilla Mail, and many others to PST format and this tool can help you to import EML files to Gmail.

Kernel for MBOX to PST