This is one of the only shipping software programs that will print labels for standard envelopes. It handles all the major selling interfaces. I have ebay, Amazon and Magento and they all work faultlessly. It also handles shipping to Canada and APO without any issues. And if you have any issues at all the support staff just takes control of your computer and they are fixed. I have never had to wait on hold over 5 minutes for support and they have always fixed my problem with the first call. Without a doubt the best support in the industry.