Outlook - How to Prefix original email contents with some character while replying to that email

What you need to do is:

• Open Tools -> Options from the menu bar to access the Options Window.

• Under the Preferences tab select the Email Options button.

• There's a section titled On replies and forwards, which contains the options you need.
  Specifically, one of the options is Prefix each line of the original message, and you can also set the character to be used for the prefix.

I'm not 100% sure but I believe these are not always strictly adhered to if you are using HTML format (or replying to an HTML format message) instead of plain text.

@DMA57361: This options prefixes all the original message with a Vertical Bar(Line) It did not take the character which i entered to prefix each line of the original message with. But I can work around by another setting present there. I can tick the box - "Mark my comments with" and enter the character i want. This character will be be prefixed to my embedded replies.

Thanks.