mix ver of esx in a cluster.

is it possibe to have mix ver of esx in a single cluster, I hav etwo ver4.1 esx hots and 4 ver5.1 esxi hots?
I know the vms hardwae are not same. that the reason I would like to have two for ver4.1 and the rest5.1  
Can I keep it like that? otherwise i have to spend money on licenses.
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sara2000Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
If you try to vMotion an unsupported VM, it will fail validation, and not move the VM.

So,

ESXi 5.1 - VM versions 4, 7, 8, 9
ESXi 4.1 - VM versions 4, 7
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes perfectly acceptable to have a mix of versions in a clustet .

As you are aware ESXi 4.1 can only host version 4.0 and 7.0 VMs.

5.1 can host 4.0, 7.0 8.0 and 9.0 so be careful with vMotions
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sara2000Author Commented:
hanccocka;
5.1 can host 4.0, 7.0 8.0 and 9.0 so be careful with vMotions
what will happen if i try to vmotion from esxi5.1 to ver 4.1 by accident?
Will it cause any damae to the VM or it will not vmotion?
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