sneding company emails to customers

How can I do this to all of my customers? The last one I done posted everyone elses address at the top, I want to email around 900 people my new offers, but only want them to see their own address at the top.
IS this possible?
Answer #1
yea it is. Cant you first use Microsoft office Access and create a database. Then in MS word start a new e-mail merge document, create the layout and info then input the proper commands for each customer from the access database. After that use Outlook to e-mail them to the right address