There should be no problems running on ESXi or moving to that platform (I use ESXi for my server). Obviously the same hardware and RAM requirements will apply to you VM. If you intend to host multiple VMs on the same server as Zimbra I'd suggest you plan your move in detail and make sure you have enough NICs to cover expected traffic and configure any VLANs before you move Zimbra to it.
I don't know if you've already looked but there's some good information on the VMware forums for advice on performance/sizing your new host server.
I forgot to add that any of the forum or wiki articles concerning the move to new hardware would also apply to this situation.
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Regards
Bill
Last edited by phoenix; 05-09-2009 at 11:33 PM..
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