Caveats
GMail Drive is an experimental package that depends on but is not provided by Google. Changes in Google's Gmail system may render GMail Drive temporarily or permanently inoperable.
The current GMail Drive does not support accounts that are with Google Apps. The Gmail Program Policies do not explicitly ban GMail Drive, shell namespace extensions, or the use of Gmail storage space for files other than e-mail. Nonetheless, immoderate use of GMail Drive may trigger Google to temporarily suspend a Gmail account.
Read more about this topic: GMail Drive