This guide will help you address common licensing questions and issues. To begin, choose from the following step-by-step scenarios:

• Obtain a new product license
• Modify my license(s) to different product(s) or different quantities
• Register or activate my license(s)
• Assign license key(s) to vSphere 4
• Locate your upgraded license from VMware Infrastructure 3 (VI3) to VMware vSphere 4

Support > Support Resources > VMware Licensing  > VMware Licensing > VMware vSphere 4 Licensing Troubleshooting Guide