Its got nothing to do with Vista/XP as its the Outlook programme that you are working with.
You may have an issue from Outlook Express to Outlook, but I have successfully copied a PST file from 1 PC to another both using Outlook with different operating systems.
Do you use a PDA because that is another option by syncing onto the PDA and then from there to the second PC.
PS
Outlook needs to be closed when making a copy of the file as it is in use while ever Outlook is open
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