i built a new ESX3 server and i already have another ESX2 servers and vcenter, my question is how can i connect my new esx server to vcenter server so i can manage it easily
If your current Virtual Center Server is version 1.x you cannot manage the ESX3 host with it. You'll need Virtual Center version 2.x to manage ESX2 and ESX3 with a single VC server. So you need to update your Virtual Center Server to 2.x.
Take a look at following table for compatibility questions:
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