Gmail GO is a lite version of Google's email client, that makes it possible to use all of Gmail’s features while only taking up half the space on your device. Literally: the official Gmail app uses around 20MB, while the GO version doesn’t even take up 10MB.
The size difference aside, Gmail Go and the standard version are practically identical. Gmail GO enables you to easily manage your inbox, send and read emails, attach files, move emails from the trash, etc. Basically, all the regular features are still available, even the customizable the email notifications.
Gmail Go is an intriguing email client, as it offers all the normal features of the Gmail app while taking up half the space, and runs well too!