How to remote into windows 7 through virtualbox on ubuntu 12.04 from outside the network

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http://askubuntu.com – I have ubuntu 12.04 installed with virtualbox 4.1.12. I have a windows 7 professional 32-bit virtualmachine with a bridged network adapter inside virtualbox. I've given a static ip to this machine with all ports open on both host and virtual machine (for now) but people outside of my network can't remote into the virtual machine, just the host. If they are on my network they're able to remote in just fine. What am I missing to allow the outside connections into the virtual machine (remote display was way too slow). Host's internal ip: port: 3389 --- Virtual Machine's internal (HowTos)