How to boot MBPro Retina with OS X Lion 10.7.5

It's due to a major incompatibility of Daylite 3 with Mountain Lion (Daylite Mail Integration) The new machine is on the shelve because it can be installed in the network with Daylite 3.X and many of the network's machines can't be upgraded to Mountain Lion and Daylite 4.X still in beta…
Only one way is to be able to boot the new MacBook Pro with the latest version of Lion which is still compatible with Daylite 3.X
Is there a trick to let this machine booting with Lion ?
Thanks

thanks

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