FreeViewerTool offers MBOX file viewer tool as free-of-cost to users which helps to open MBOX files without any application uses. No Thunderbird or any MBOX supported email application is required for the software to open and display the content of MBOX files. MBOX files are generated by more than 25+ email applications/ client's and all these MBOX files are properly supported by FreeViewerTool MBOX Viewer Software. While using the software, user can search and view MBOX emails according to To, Cc, Bcc, Subject and Attachments. The software also provide facility to view mbox files of every single email message in separate window. This MBOX Viewer Tool is also available as PRO Edition and PRO PLUS Edition for user's- MBOX Viewer PRO Edition- The PRO Edition provides facility to convert MBOX files to PST Outlook, EML, MSG, EMLX, HTML, MHTML, and Thunderbird. MBOX Viewer PRO PLUS Edition- The PRO PLUS Edition covers all the features of PRO Edition as well as allows to import MBOX files to Office365, Gmail, G-Suite, Yahoo Mail, Outlook.com, IMAP Account, and etc. This MBOX Thunderbird Viewer tool is also capable to open Thunderbird profile mailboxes in a well-structured format and the same allowed to convert into any format. The freeware version of MBOX Viewer has no limitation on the opening of MBOX files or the previewing of unlimited MBOX emails. The software is compatible with all the Windows versions including Windows 11 and all lower versions. In addition, this tool has a very simple GUI to help beginners to technically sound users to easily operate and use this tool.