Download a message as .EML file
Downloads a single message as an .EML file (RFC 822 / MIME). Supply Message Id, User Id, and MailFolder Id; the message is saved to the path given in TargetFilePath. The file can be opened in most email clients and includes attachments.
SELECT * FROM
download_message
WITH(
MessageId='AAMkADliN2RmZGM4..........3JFHGAAf2n2J-AAA=',
SaveFolder='c:\temp',
OverwriteFile='True',
--UserId='me', --or use "user-id" or use "email"
--UserId='someuser@mycompany.onmicrosoft.com',
--UserId='1487fe8b-f09f-4015-a817-b8b9fe2a3edc',
MailFolderId='INBOX' --or use mailbox ID
)