Exchange supports multimedia formats by storing Multipurpose Internet Mail Extensions (MIME) content directly in an .stm file. Clients using standard Internet protocols such as HTTP, Simple Mail Transfer Protocol (SMTP), Internet Message Access Protocol version 4 (IMAP4), and Post Office Protocol (POP) can store audio, video, voice, or other multimedia formats as streams of MIME data without conversion. This saves time and system resources. When a MAPI client attempts to read a message in a .stm file, the file is converted (using document property promotion) and sent to the client.
When an Internet mail message comes into a mailbox store, the body of the message is saved in the .stm file, and the header information (From, To, CC, Time Sent, and so forth) is converted to Rich Text Format (RTF) and stored in the .edb file.
Note Because messages with MIME content are divided and stored in the .edb and .stm files, move both files for a given mailbox store.
Related TopicsAutomatic Document Property Promotion