Complete these steps before starting your upgrade procedure.
If the virtual machine is suspended, resume it in the earlier release, shut down the guest operating system, then power off the virtual machine.
If you attempt to resume a virtual machine that was suspended under a different VMware product or a different version of VMware ESX Server, a dialog box gives you the choice of discarding or keeping the the file that stores the suspended state. To recover the suspended state, you must click Keep, then resume the virtual machine under the correct VMware product. If you click Discard, you can power on normally, but the suspended state is lost.
If you plan to use existing virtual machines that have undoable disks, commit or discard any changes to the virtual disks before you remove the release you used to create them.
Resume or power on the virtual machine in the earlier release, shut down the guest operating system, power off the virtual machine and either commit or discard changes to the undoable disk when prompted.
As a precaution, back up all the files in your virtual machine directories — including the .dsk, .cfg or .vmx files — for any existing virtual machines you plan to migrate to VMware ESX Server 1.5.
Virtual machines updated for full compatibility with VMware ESX Server 1.5 cannot be used under earlier versions of VMware software.
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