SysTools MSG Viewer Pro is described as 'software to search and print MSG files to PDF format without data loss. Capable to search Emails, Calendars, Attachments using Different Criteria. Easily batch print Outlook Message Files with Attachments'. There are four alternatives to SysTools MSG Viewer Pro for Windows, Mac and Linux. The best alternative is MsgViewer, which is both free and Open Source. Other great apps like SysTools MSG Viewer Pro are MailsDaddy Free MSG Viewer (Free), MSG VIewer for Outlook (Free) and CoolUtils Mail Viewer (Free).
MsgViewer is email-viewer utility for .msg e-mail messages, implemented in pure Java. MsgViewer works on Windows/Linux/Mac Platforms. Also provides a java api to read mail messges (msg files) programmatically.
MailsDaddy Free MSG Viewer software is coded for screening entire statistics in few seconds of orphaned/corrupted MSG files without using any email client. The MSG viewer tool works for complete newer editions and older editions of Windows Operating system in free of cost.