Hi Phil,
You can download an envelope template here:
http://office.microsoft.com/en-us/te...043141033.aspx. There are many unique, non-standard folding patterns available. Once you have downloaded your template, all you have to do to use it is Click the Microsoft Office Button, select New, then clicked Installed Templates. Highlight the template you want, then click Create.
I hope this helps!
MSFT Office Outreach Team