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Which versions of ESX Server 2.x are supported for VMotion upgrades?
When performing migration upgrades using VMotion, you transfer virtual machines from a host with a supported version of ESX Server 2.x to an ESX Server 3.0.1 or later host. The following versions of ESX Server 2.x are supported for migration upgrades:
ESX Server 2.1.2
ESX Server 2.1.3
ESX Server 2.5.2
ESX Server 2.5.3
If you use unsupported versions of ESX Server 2.x, upgrades can fail. To avoid data loss or corruption, do not attempt to perform migration upgrades from the following unsupported versions:
ESX Server 2.5.0
ESX Server 2.5.1
ESX Server 2.1.0
ESX Server 2.1.1
ESX Server 2.0.x
For more information on performing migration upgrades with VMotion, see the Installation and Upgrade Guide.