Admin Audit Log Viewer: Track Admin Changes in Google Apps
If you have multiple admins in your Google Apps domain, you’re taking over for a former admin, or you just want to remember what changes you made, the Admin Audit Log Viewer can help. When you access the Admin Audit Log Viewer, you can see what kind of changes have been made, when they were made, and who made them. You can also click on each entry to see more information about what exactly was changed.
This tool can be useful if you suspect your domain has been hacked or someone has administrator access that shouldn’t. You can download the desktop version of this app for free on the Google Apps Marketplace, or you can download the mobile version either at the iTunes store or at the Google Play store.