Read .msg file with Java mail API

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edit 20-12-2019: the email conversion logic has been moved to a dedicated open source library: outlook-message-parser (the EmailConverter class in Simple Java Mail is still there as well).

original answer:
Simple Java Mail, an open source library for sending emails over SMTP has an EmailConverter class that can read and convert Outlook messages directly to MimeMessage, Email or EML.

Under the hood it uses a fork of msgparser (Outlook Message Parser), which on its turn uses Apache POI.

From the Features page:

// from Outlook .msg
Email email =             EmailConverter.outlookMsgToEmail(readToString("yourMessage.msg"));
Email email =             EmailConverter.outlookMsgToEmail(new File("yourMessage.msg"));
Email email =             EmailConverter.outlookMsgToEmail(getInputStream("yourMessage.msg"));
String eml =              EmailConverter.outlookMsgToEML(readToString("yourMessage.msg"));
String eml =              EmailConverter.outlookMsgToEML(new File("yourMessage.msg"));
String eml =              EmailConverter.outlookMsgToEML(getInputStream("yourMessage.msg"));
MimeMessage mimeMessage = EmailConverter.outlookMsgToMimeMessage(readToString("yourMessage.msg"));
MimeMessage mimeMessage = EmailConverter.outlookMsgToMimeMessage(new File("yourMessage.msg"));
MimeMessage mimeMessage = EmailConverter.outlookMsgToMimeMessage(getInputStream("yourMessage.msg"));

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