Just FYI in case anyone else is experiencing this issue. I upgraded to 8.1 earlier today, and my mail server running on a Win 8 VM stopped responding to IMAP and SMTP requests. Pretty much, the VM didn't have networking. I spent a lot of time on this, using vmnet-cli -c and --stop and --start and editing the nat.conf file and trying other things. I even removed and reinstalled Fusion 8.1. It finally came down to realizing that any time I tried to forward a port to the VM, networking broke for vmnet8. Luckily, I could get 8.02 (just the .app dir) back from a time machine backup and it's all working just fine again.
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