Billy, a computer forensics expert, has recovered a large number of DBX files during forensic investigation of a laptop. Which of the following email…

The .dbx file extension is the native format used by Microsoft Outlook Express for storing email folders. Each folder within the email client, such as the Inbox, Sent Items, or user-created folders, is saved as a separate .dbx file (e.g., Inbox.dbx, Sent Items.dbx). Therefore, to analyze these files within their native application environment, a forensics expert would use Microsoft Outlook Express. While modern forensic tools can parse .dbx files, the question specifically asks for the email client that uses this format.

A. Microsoft Outlook uses the Personal Storage Table (.pst) and Offline Storage Table (.ost) file formats to store mail data, not .dbx.

C. Mozilla Thunderbird primarily uses the MBOX file format, where all emails in a folder are concatenated into a single text file.

D. Eudora also used a variation of the MBOX file format for storing its email messages, not the proprietary .dbx format.

1. Carrier, B. (2005). File System Forensic Analysis. Addison-Wesley Professional. In Chapter 15, "Email Analysis," the text details the file structures of various email clients, explicitly stating, "Microsoft Outlook Express stores each folder of messages in a separate file with a '.dbx' extension" (p. 438).

2. Casey, E. (2011). Digital Evidence and Computer Crime: Forensic Science, Computers, and the Internet (3rd ed.). Academic Press. Chapter 14, "Network Forensics," discusses email analysis and identifies .dbx files as the database files used by Outlook Express to store messages for a particular folder (p. 551).

3. Maras, M. H. (2014). Computer Forensics: Cybercriminals, Laws, and Evidence (2nd ed.). Jones & Bartlett Learning. In the section on email forensics, the text identifies the file formats for major email clients, associating .dbx files specifically with Outlook Express.