Event ID 202

Background: 6 months experience as IT Administrator and at this position.

Discussion: While checking Application Log on one of my W2003 servers, I came across this error ? License Service Event ID: 202. I read the MS support pages, etc. Basically I found that under AdminTool/Licensing/Clients, there are approx 108 ?clients? that ARE NOT current employees. Under PROPERTIES it shows the last log-on date. Some are over 5.5 years old.

THE QUESTIONS: Should I delete these people or just revoke the license? and what is the difference between revoking and deleting?

MY THOUGHTS: Delete these people and keep the data base clean all the time to only reflect current employees.

Much thanks in advance for guidance.