From the developer: "NetMailDisk is a tool which can help you make a large online disk with several E-mailboxes. The more mailboxes you add, the larger online space you can enjoy. With only a few mouse clicks, you can store your files on internet and access it wherever you are. For Example, if you add five mailboxes(4MB) to NetMailDisk, you will enjoy an online disk of 20MB. A single file you store in it can be even larger than 10MB."