Vmware migration

I have 10 seperate vcentre servers. All are having different versions of esx and i want to built a new one and migrate all the 10 vcentre servers in one vcentre with 5.5 version. Whats the procedure?
Ajinkya BhoiteAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's quite simple. There is not really a migration.

1. Ensure you new vCenter Server has network communications with all the hosts.

2. Ensure you vCenter Server is compatible with all your hosts.

3. Remove the ESXi hosts from the current vCenter Server which is managing the host and VMs. (that's all vCenter Server does, doing this will cause no downtime of the VMs).

4. Add the ESXi host vers to the new vCenter Server.

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