This article from The Chronicle of Higher Education website provides helpful information regarding Google Labs. The information on this page is to assist you in using some of the Google labs. IMT does not formally support these apps and the use of them is at your own risk. Should you encounter a problem and you are unable to access your Inbox, Google provides a way to disable labs by clicking this link: https://mail.google.com/mail/u/0/?labs=0.
All About Google Labs
It’s important to note that everything within Gmail Labs is in a state of being tested. As such, the features can unexpectedly go away without any warning.
Every Gmail account can use Gmail Labs. Simply click on the “Settings” button in the upper right corner of the screen and then choose the “Labs” tab. You’ll then be presented with a list of different Labs features that you can enable on your account. Click as many or as few as you’d like, and then click “Save Changes” at the bottom of the page. When you do this, 9 times out of 10 Gmail will reload so that your new Labs features are enabled. In some instances the labs maybe not be available immediately, be patient, they will appear within 30 minutes or so.