VMware ESXi 6.0 U2 is an update to the ESXi 6.0 hypervisor, which was released in March 2015. The "U2" in the version number indicates that it is the second update to ESXi 6.0. This update includes various bug fixes, security patches, and performance enhancements.
For administrators running unsupported legacy hardware (e.g., older Dell PowerEdge R710s, HP ProLiant G7/G8 series) that cannot officially run ESXi 6.5 or newer, that offers decent driver support. vmware esxi 6.0 u2 download iso