Gmail's huge storage (7 gigabytes) may tempt some to use it as a file storage system. Because of the tedious process of putting one attachment after another and sending it to yourself, someone has taken the liberty of developing a program to add a shell extension to Microsoft's Windows operating systems. There are many different shell extensions (it may take a bit of digging through Google's search engine), each with their own advantages and disadvantages. Here is one to try out, the most popular and well known GMail Drive! There is also an extension for Firefox called "GSpace" that does the same thing.