Use an email client that supports MBOX files, such as Thunderbird, Apple Mail, or Outlook with an add-on
Import the MBOX file into the email client
Open the imported mailbox folder to view the messages
Use an MBOX viewer tool if you only need to read the file without importing it
Convert the MBOX file to another format if your email app does not support MBOX directly
Open the file with a text editor only if you need to inspect raw email data
Ensure the MBOX file is not corrupted before opening it
Keep a backup copy of the original file before importing or converting it