Persistent Entry in Applicatioin Log -- Event ID 1147

Exchange 5.5 w/ SP4. The following Event ID is written to the Event Viewer's Application Log on my Exchange Server twice a day. Once at 10:00am and 3:00pm. I realized that my Storage Warnings are set to occur twice a day at these specific times. I was unable to find any information in TechNet

Failure Audit - Event ID 1023

Whenever one of my users opens/executes the Outlook program, (which is several times a day -- this user choses to exit the Outlook Program and doesn't minimize it) the following entry on the Exchange Server Event Viewer's Application Log is written to: Event Type:Failure Audit