Mountain Lion Security
Gatekeeper is a new feature in OS X Mountain Lion (10.8) that helps protect users from downloading and installing malicious software. Read more about Gatekeeper
Sync to Contacts (Address Book)
As part of the new Mac OS X Mountain Lion security features, you'll get a message (AccountEdge ... would like to access your contacts) when you attempt to sync the contacts in your AccountEdge company file with Address Book. Selecting OK adds AccountEdge to the apps allowed to access your contacts.
You can review the list of these allowed apps in the System Preferences > Security & Privacy pane.