move virtual machines from esxi4 to esx3.5

I have 2 esx servers, one with esxi 4.1 and one with esx3.5
the virtual machines are stored on a nas, my idea is that if one server fails, I just load the vm's on the other esx server.
the question is that I'm not sure if I can load vm's created on the esx4.1 server on the 3.5 one, is it possible just adding the vm or do I have to convert it first?
uilliAsked:
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Randy_BojanglesCommented:
This is a "yes and no" answer I'm afraid

Yes you can just load them without conversion per se

BUT

if youve created them on ESXi 4.1 they may use Virtual Machine Hardware version 7 (you can see what version on the Vm within the VI Client)

ESXi 3.5 supports VM hardware version 4 (dont ask about what happened to 5 and 6 !) but not 7 so if they are hw version 7 you cant do what you want to do

AFAIK there is no way to go back to version 4 from version 7 but I'm happy to be proved wrong!

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uilliAuthor Commented:
thanks

i've read the only way is to use vmware converter to convert virtual hardware from 7 back to 4
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