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Title
Replication from ESXI 5 to ESX\ESXI4 -
Description
You want to replicate from a newer version of ESX(i) to an older version. This VMware KB details what virtual hardware provisions exist that factor into this issue:
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Cause
Due to the inherent Virtual Hardware mismatch element involved in moving machines to a previous ESX(i) host version, this is not allowed at the VMware ESX guest virtual hardware version-checking level.
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Resolution
Upgrade your target host to the same version of ESX(i)