VirtualPC seems to be involved, since it shows up in two of your backtraces. Perhaps something goes to sleep while you're not using the machine, and then some network traffic comes in through the network, causing it to crash.
Do you need Outlook in VPC? Can't you use VPN on the Mac, and perhaps just another mail program (or Entourage, if you need more than just mail from Outlook)? Trying that would at least help to narrow the problem down. Perhaps you could start by trying to set up the VPN on the Mac, but keep using Outlook. It could be that the VPN software is doing funny things to Windows/VPC.
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