A. Yes, and this is actually required as part of the best practice upgrade process. When you want to migrate from ESX 3.5 to ESX 4, the upgrade order is:

  1. Upgrade vCenter to version 4.
  2. Upgrade vCenter Update Manager.
  3. Upgrade the ESX hosts.
  4. Upgrade VMTools and VM Hardware for the virtual machines.

As you can see, as part of the upgrade order, you have to manage the ESX 3.5 servers from the version 4 vCenter.

Note that vCenter Server 4 actually supports ESX 2.5.x, 3.0.1 and above, 3.5 and 4. This can be confirmed in VMware's compatibility matrix.

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