As the need for business email applications grows, the market for tools is filled with many email services that customers choose from based on their wants and needs. These days, email apps are made to handle letters and keep track of personal data. There you have it. All of these email clients store their info in one way or another, either in the cloud or on your computer. When it comes to local storage email file types, MBOX is by far the most common one. The next part will explain more about the MBOX file and how to fix a file problem called "No valid MBOX files were found."

How Well Do You Know What an MBOX File Is?

A MBOX file, which stands for “Mailbox,” is used to store email messages from Apple Mail, Entourage, Thunderbird, MuttMail, PocoMail, and other desktop email apps. This file can be found in different places depending on the email client, but the most usual place is User/Library/Mail/Mailboxes/directory. The MBOX file is called “Inbox messages” in an IMAP email system. All the emails are put together so that a lot of information can be stored in one file. Everything in this file format starts with a five-letter title that says “From.” This is followed by a space and the sender’s email address.

After getting rid of any questions about the MBOX file, think about the following situation, which was given by a user of Apple Mail for emailing:

“I have used Apple Mail for a long time.” My OS got damaged because of a problem I had with my system a few days ago. Luckily, I was able to save a copy of the info. A lot of experts looked at my system, but they couldn’t figure out what was wrong. So, they told me to switch from Mac to Windows as the operating system. These are copies of my MBOX files that I now have, but I can only open them in Windows. I’m running out of time and need a professional way to look at the files. Could someone please give me some ideas?"

There were no valid MBOX files found. The error causes and their solutions

Well, ways to fix the problem rely on what is causing the MBOX file error message. As a result, one must first understand the situation that led to the problem and then choose the appropriate answer to fix it.

Case 1: Different Versions of Mac OS

When users move an MBOX file from a newer or older version of Mac OS to an older or newer version, there may be a problem with how the files work together. These changes in the Mac operating system cause the "No valid MBOX files were found" error on this OS. Because of this, a way needs to be found to make MBOX files work on a current system without any problems.

Working around the problem: For safety reasons, you should do the steps below first before attempting to fix the problem:

• These files should be backed up: ~/Library/Preferences/com.apple.mail.plist and ~/Library/Mail/
• The following steps will help you make a backup of the secret library folder:
• Find “Go” and click on it. Type ~/Library/ in the text box after going to Folder.
• To go on, press the “Go” button.

Find where you saved the MBOX file you want, click on it, and then click on Choose.

Look at all of the extracted messages and click on “Continue.”

• Start up Mail.app again, look at Import Mailbox, and move folders back to where they were before.
• Make sure the system finding tool is up and running.
• In that case, use the sudo mdutil tool to rebuild the Spotlight index. If not, skip this step.
• Finally, the whole process of importing is over, and you can look at the Preferences list to see how the mail rules work.

Second Case: The external device and Mac machine were not properly synced.

An external device, such as a pen drive, an external hard disk, or something similar, is what most users do to store old email records. So, when these end users try to open the file straight from the device, they get an error message that says “No valid MBOX files were found.” In this case, these outside parts need to be exported as MBOX files.

Workaround: The cause of this problem can be fixed in the same way that you fixed the import problem above. This means that the process of importing that was explained to fix the error caused by differences in Mac OS will work the same way for this cause.

Third case: error because of a fault in the directory level

If the MBOX file ends up in the wrong directory level by accident, there is a good chance that an error will occur. Users will keep getting the message “No valid MBOX files were found” when they try to open and read the file.

Workaround: If the problem is caused by an incorrect directory level, take these steps to fix it:

• One by one, make a copy of the directory level
• Go to /Home/Library/Mail/Mailboxes and pick out mailboxes from the folder you’re in now.
• Pick any MBOX file you want to import, and then follow the steps you’ve already been using.

Expert Suggestion

We've looked over the question above and think that Softaken MBOX Conversion suite would be very helpful in this case. People who use the tool can easily look at all the items on the Windows Platform. The tool can open and read both MBOX files and their attachments. To look at the.mbox files, you wouldn't need to add any extra email clients. One of the best things about the tool is that it doesn't have any file size limits. Now that you know how to get to MBOX files, download the tool.

Ending It All

Users should now have a good understanding of the idea after reading the above article. There were no good MBOX files found. The whole article is about what errors are and how to fix them. Users who are short on time should use the MBOX Viewer tool to quickly look at MBOX files in Windows.