You can use your Google Mail account as a file system via GSpaceMobile. Local files in your phone can be uploaded into your Google Mail box, and remote files in your Google Mail box can be downloaded into your phone and cached somewhere (Actually, the caching location may be C:\Data\GSpaceMobi\@Google Mail.com\, or E:\GSpaceMobi\@Google Mail.com\, depending on your downloading configuration in this application).

This tool is compatible with a Firefox addin Gspace. With this addin, you can upload your favorite or private files (such as pdf ,mp3, etc) from a desktop environment and download and use them in a S60 mobile phone, and vice versa. Please see appendix A for how to get Firefox and the addin - Gspace. In a free version, you can upload or download files not more than 1MB in size, and can only use one Google Mail account. If you use a licensed version, those limitations do not exist except for Google Mail's limitation itself. You can add as many Google Mail account as you want, so, the maximum capacity you can get is unlimited in theory.

Note: It may cause network fees via some kinds of bearers, determined by your local network service provider. You should be aware of this in advance.