The website says:
Over the past 18 months, we have observed a significant decline in the use of the job board by both job-seekers and corporate partners. That, and personnel changes within the organization, suggest that it is an appropriate time for the Job Board to cease operations.
The OU has made available on its website the entire collection of our highly-acclaimed courses and seminars that will remain available for use free of charge. You may access them here.
All jobs and resumes currently posted on the OU Job Board will remain posted through March 31st.