Open BAD File
BAD extension files are mainly used as email message failed to be delivered by Microsoft Exchange Server.
More About Microsoft Exchange Server
Microsoft Exchange Server is a mail server and calendar server software developed by Microsoft.
This software is exclusive to Windows Server operating systems.
The first version was called Exchange Server 4.0, to position it as the successor to the related Microsoft Mail 3.5, today it is just known as 'Exchange'.
This BAD file includes the message sender, recipient(s), subject, and body, just like the original message.
The BAD files, referring to a failed email, are stored in the folder named 'Badmail' together with the BDR and BDP files.
BAD files are text files that provide information that can be accessed, either by transferring them to the Pickup folder or by changing the extension to the TXT extension, and can be opened with any text editor.