Several users are there who look for free software. No doubt, several manual solutions are available which are free of cost but they are not tested by the professionals. After that, users look for other free of cost solutions.
The main reason behind the need of free software is when users don't have required email client to open files. Users look for the solutions to open these files. For example, if a user has recently switched to the webmail service like Gmail and has left Thunderbird email client. After some time, the user got some MBOX files from one of his/her clients. Now the problem is he/she can't view MBOX file without Thunderbird client.
Here are some free tools provided by Softaken that helps the users to open required files without having a suitable email client.