Email for ms outlook is located in one file, easiest way to get this is by opening outlook 2007
click tools
clcik options
click on mail setup tab
click on datafiles button
you will then see the mailbox files and location where it is.
from there you can coy the location of the file and paste in your run command for it to open the exact file location.
If u talking about a single message easiest way is rather to save the message in a separate folder using outlook.