GMail Drive was a free third-party Windows Shell namespace extension ("add-on") for Google's Gmail. GMail Drive was not supported by Google.
It allowed a user to access a virtual drive stored in a Gmail account by causing the contents of the Gmail account to appear as a new network share on the user's workstation.
The add-on enabled the user to use the standard Windows desktop file copy and paste commands to transfer files to and from the Gmail account as if it were a drive on the user's computer.
GMail Drive uses the inbox of the Gmail account to store files and creates a virtual filesystem on top of the Gmail account, enabling the user to save and retrieve files stored on the Gmail account directly from inside Windows Explorer.
When the user creates a new file using GMail Drive, it generates an e-mail and posts it to the Gmail account's inbox. The e-mail appears in the normal Inbox folder when using the normal Gmail interface, and the file is attached as an e-mail attachment.
