I need to determine what message format (Plain-text, RTF, HTML, etc) an email message is in. I have the
.MSG file from the sender's sent items folder. Is there a way I can check this in Outlook 2010?
You need to look at the email messages header. Depending on your email client this can be achieved a number of ways.
Steps in outlook to see the message header:
At the end of the header you'll see a line like this: