Add2Exchange has the ability to log most actions the program goes through and has three levels:
Application Logging Settings

Tip: In the normal operation of Add2Exchange, there is no need for Full Event Logging because it makes synchronization slower. Full Event Logging has a dramatic negative impact on performance.
Add2Exchange Event Log

To see the logged events, from the Service Utility you can select the View Events button and it will automatically open up the Event Viewer. The Event Viewer can also be opened from the server's Control Panel, Administrative Tools. Select the Add2Exchage Log for program specific log information.