Nagios is sending emails notifications that are 2 years ago


Dear brothers,

This box was lying around for while and we decided to switch it on and install new version of Nagios for network monitoring. When the agent was started, Emails from year 2005 and year 2006 started to be triggered to the people.
I had already replaced all the cfg files and upgraded to Nagios 3.x it is still triggering mails. This caused a panic until i clarify with all who received that the email was dated 2005. LOL. What can be the issue for this to be happening? I was given restraint order from starting the service unless i am sure it is not going to be sending old alerts!! help help