What version of BES are you using?
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1) After his ZCS migration, he wants to update ZCB version to 7, it will work directly or does he have things to do ?
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You can upgrade to latest ZCB if your running BES 5.x. If he is running BES 4 he will need to upgrade to BES 5. All those steps are in the ZCB documentation and its straight forward.
I do not know the answers to the rest of your questions. But I will assume the BES migration to another box will have to be a hard cut over.