From the blog

HostBill 4.4.6 Release

Another week passed, another package of updates from HostBill team. Introducing:

vmWare vSphere 5 support
We’ve created brand new module to support vmWare vSphere (ESXi) version 5 – with automated VM provisioning and rich client area controls:
vmware5_client_func
Learn more about this module at http://hostbillapp.com/features/apps/vmware5.html

For full changelog visit http://hostbillapp.com/changelog