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MSG MSG (Document)

File extension .msg
Category Document File
Description MSG was originally designed for the Microsoft Exchange mail document, this format is widely used by all of Microsofts infrastructure solutions. MSG files consist of main message body, calender, contacts and reminders, these are arranged in a hierachial directory structure and underpinned by MAPI (Microsofts Messaging Application Programming Interface).
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Technical Details A MSG file are often formed by Outlook Express of Microsoft Outlook. They are saved as COM structured storage OLE2 compound documents and consist of several streams with sub tags. A MSG file maybe encoded in either Binary or ASCII.
Associated programs
  • Microsoft Outlook
  • Priasoft MSG File Viewer and Assessor
  • Encryptomatic MsgViewer Pro
Developed by Microsoft
MIME type
  • application/vnd.ms-outlook
Useful links

PST PST (Document)

File extension .pst
Category Document File
Description A Personal Storage Table (.pst) is a file that is used to store copies of messages, calendar events, and other items within Microsoft software such as Microsoft Exchange Client, Windows Messaging, and Microsoft Outlook. PST files are used for archiving email data offline that can be later loaded and viewed in various applications.
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Technical Details PST file formats have two types which are based on the encoding. ANSI encoded PST files are generally older file formats, supported by Microsoft Outlook 2002 and earlier versions - these files have a maximum size limit of 2GB and do not support Unicode. The more modern file format is based on Unicode encoding and removes the file size limit and can reach a maximum size of 50GB.
Associated programs
  • Microsoft Outlook 365
  • Microsoft Exchange Server
  • Encryptomatic PSTViewer Pro
Developed by Microsoft
MIME type
  • application/vnd.ms-outlook
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