Those are two separate questions. When you forward a message that has an
attachment, the attachment is automatically included.
To save the message and the attachment, open the message, click on File -
Save As and save the message as an "msg" file. That will save the text of
the message as well as the attachment. The downside is you need Outlook to
open the file again. You could also save the message as a text file but then
you would also have to save the attachment in an additional step
(right-click on the attachment and choose Save As).
Tim