If Microsoft Outlook is not installed on your system, you can still open and read MSG files using a dedicated MSG viewer. These tools are specifically designed to read Outlook MSG files without requiring you to set up an Outlook account or profile. SysTools MSG Viewer is one such option that can help you access the email body, sender and recipient details, subject, date, and other message information. This can be useful when you only need to read old MSG files rather than install Outlook just for viewing them.