Import MBOX File Greyed Out in Thunderbird

Jamie Kaler
Published: Oct 4, 2023 ~ Tips

An MBOX file is a versatile file format. It is compatible with many email clients. But sometimes users face some issues with MBOX files. One of the frequent errors is the “Import MBOX File Greyed Out in Thunderbird”.

Thunderbird is a popular email client. Many users migrate or store their data into the .mbox format in order to access and examine it inside their Thunderbird profile. For example, if you use MS Outlook at work and need to move your data to your home, where you have Thunderbird installed, you would first need to convert MS Outlook to MBOX format and then open the MBOX file in Thunderbird.

There may be many such circumstances where one must save their data as MBOX and then import the MBOX file into the Thunderbird profile. But if you try to import an MBOX file into Thunderbird, the option becomes grayed out and you can’t import the file.

Know About User Concerns

“Hello everyone! For the last several years, I’ve been using Mozilla Thunderbird. I attempted to import MBOX files into my Thunderbird account yesterday, but I received an error notice reading “impossible to import in this folder Thunderbird.”

I’ve verified everything, including my internet connection, and tried to import the files again, but the outcome remains the same. Please advise on how to successfully fix the Import MBOX File Greyed Out in Thunderbird problem.

Possible Reasons for Import MBOX file Greyed Out

There are many reasons that might be causing this problem. Users must determine the root cause of their problem. Some significant problems are addressed here. Examine them out:

It could be possible that the MBOX file is not healthy. Due to the fact that Thunderbird does not detect it and disables the import option.
The Thunderbird application has some bugs.
It may be that it is not updated, which makes it difficult to respond to basic features.

Manually Fix Import MBOX File Greyed Out in Thunderbird Error

First, check the MBOX file’s header to make sure its structure is not broken.
Try to update to the the latest version of Thunderbird and see if this works for you.
Close the Mozilla Thunderbird. Launch the application again and try to import the MBOX file then.

If none of the following options work, users must switch to using a third-party program.

Smart Solution to Resolve “MBOX File Greyed Out Error”

Jagware MBOX to PDF Converter is the only solution that easily converts corrupted MBOX files to PDF without any interruption. It has a direct option to upload an MBOX file directly to Thunderbird. A Thunderbird installation is necessary to view MBOX files in Thunderbird. You can also use the free MBOX viewer to read the MBOX data. This utility supports all types of MBOX files which are created from any email client such as Entourage, Apple Mail, Eudora, Opera Mail, etc.

Conclusion

We have provided the best solution for how to import MBOX file greyed out in Thunderbird error. It is a very common issue faced by Thunderbird users. But the best option is to convert MBOX files to PST or other formats so you can easily read them without any errors.