Synchronizing Over the Internet
Believe it or not, it doesn't take much to change the setup described in this article in order to allow your Pocket PC to synchronize over the Internet. All you have to do is make sure the TCP ports 990, 999, 678, and 5679 on your wireless/wired router are forwarded to the local IP address of your desktop machine. Rather than establishing your connection to an internal IP address, as described in this article, you can specify your external WAN IP address (or if you have registered a domain name that you have pointed at your static IP address, you can specify that). Doing this will allow you to synchronize both your Pocket PC and your desktop machine back home.
Figure 13 Synchronizing Over the Internet