Quick migration is included but live migration is not included in the free version of ESXi

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ESXi 4.1 does not include any live migration technologies and if you need small scale Vmotion for only live migrations then look at Essential plus from Vmware, 6 CPU (max 3 hosts) plus VC, if you need the automated (DRS) moves you need to go high in the VMware ladder of offerings such as enterprise.

hope this helps

Evaluation Version contains all the features.

http://www.vmware.com/products/vmotion/overview.html