Personally I like to place my business address at the bottom of the page or the footer. To do this go to the floating bar and click on the button, 'Switch Between Header and Footer.' This will open a dotted box at the bottom of the document. You can type your office address here or anything you see fit for your letterhead. Again you can format the text by choosing the font, font size, color, align the text, etc.
Writing Letters _ Word allows a simple way of writing and formatting letters. Whether it is a personal letter or a business letter, it offers special programming that serves as a guide for correct letter format. This is especially useful if you need to come up with a bunch of letters written to various business or home addresses.