File with .MBOX extension contains an email message box file which stores list of messages for given recipient in sequential order. MBOX is a text file, and each message referenced in such file starts with ‘From’ header and ends with newline character. MBOX format is not standardized in any RFC document and as such its structure largely depends on the software that uses this format for archiving email messages.
MBOX files (referred to as MailBOX) were first used by a simple Unix mail client. Mac OS, which is based on Unix, used the MBOX format for its first mail client. The format has many disadvantages, some of them being:
MBOX format was the base for 4 other mailbox formats – mboxo, mboxrd, mboxcl, and mboxcl2. Those formats are not compatible with each other, although all are based on MBOX. MBOX text files can be opened with any text editor, but editing such files is not advised as it may caused read errors.
The following list contains programs grouped by 3 operating systems that support MBOX files. Files with MBOX suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.
Problems with accessing MBOX may be due to various reasons. Fortunately, most common problems with MBOX files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with MBOX files.
The main and most frequent cause precluding users form opening MBOX files is that no program that can handle MBOX files is installed on user’s system. The most obvious solution is to download and install Mozilla Thunderbird or one to the listed programs: Apple Mail, Eudora, Microsoft Outlook. Above you will find a complete listing of programs that support MBOX files, classified according to system platforms for which they are available. If you want to download Mozilla Thunderbird installer in the most secured manner, we suggest you visit Mozilla Corporation website and download from their official repositories.
If the problems with opening MBOX files still occur even after installing Mozilla Thunderbird, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of Mozilla Thunderbird is available. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. This can be one of the causes why MBOX files are not compatible with Mozilla Thunderbird. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Mozilla Thunderbird.
If you have the latest version of Mozilla Thunderbird installed and the problem persists, select it as the default program to be used to manage MBOX on your device. The method is quite simple and varies little across operating systems.
The procedure to change the default program in Windows
The procedure to change the default program in Mac OS
Should the problem still occur after following steps 1-3, check if the MBOX file is valid. It is probable that the file is corrupted and thus cannot be accessed.
If the file is infected, the malware that resides in the MBOX file hinders attempts to open it. Scan the MBOX file as well as your computer for malware or viruses. If the MBOX file is indeed infected follow the instructions below.
If the MBOX file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. If the MBOX file has been downloaded from the internet only partially, try to redownload it.
Some files require elevated access rights to open them. Log out of your current account and log in to an account with sufficient access privileges. Then open the E-mail Mailbox Format file.
If the system is under havy load, it may not be able to handle the program that you use to open files with MBOX extension. In this case close the other applications.
Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with E-mail Mailbox Format file. It may be the case that the MBOX files work properly with updated software that addresses some system bugs.
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