Envelopes is an envelope editor. When you first open the application, you would provide your mailing addresses which will be in the top left corner of the envelope. If you have multiple addresses, you would be able to choose the most appropriate one in a drop down menu. In the center of the envelope, you would be able to compose or save envelope files that you would be able to use to print over and over again. If your contacts has a mailing address in it, you could use that mailing address in the center. The Envelopes program will support all of the global standards for mail sizes. Envelopes is only available on the computer OS?.