On the top of MS Word you'll find the menu bar. Click on 'View' and then 'Header and Footer.' What appears is a dotted box already with a cursor inside. A floating menu bar also appears.
Creating Envelopes _ Your letter will not be complete unless you have an envelope also formatted appropriately. What's good about this function is that you can either customize your own envelope or allow Word to come up with a matching envelope to the letter you have written using the application. What it does is it automatically copies the address and uses it to create the envelope. That helps you do away with manual typing.