Years later I have a response.
-
Use an online code highlighter like http://tohtml.com/ to highlight your code so you can paste marked up code from your IDE into Word. Depending on your IDE you may be able to skip this step.
-
In Word 2010, go to insert->object->openDocument Text. Steps 2-3 are documented at How do you display code snippets in MS Word preserving format and syntax highlighting?.
-
Paste your highlighted code into the object.
-
Copy the whole object.
-
Right-click-> paste special the object into Outlook.
This gives you a highlighted, contained box of code for use in emails in Outlook 2010.