Yes, vCenter 5.5 can manage ESXi 4.x and 5.x
As for your 4.1 VM's once they are migrated to the ESXi 5.5 hosts, take a snapshot of the VMs first and perform the following:
1. Upgrade the VMware Tools
2. Upgrade the virtual hardware (optional)
Yes, vCenter 5.5 can manage ESXi 4.x and 5.x
As for your 4.1 VM's once they are migrated to the ESXi 5.5 hosts, take a snapshot of the VMs first and perform the following:
1. Upgrade the VMware Tools
2. Upgrade the virtual hardware (optional)