Hello, curious if someone can confirm if this would work. I currently live in a building where they provide good, free wifi. They are using linksys routers which are not capable of being extended wirelessly with my Airport Extreme. I was able to get the older Airport Utility that allows me to Join a wireless network. The problem is currently I only have the Extreme not the Express. I've read found that once you have the Express in Join Wireless Network mode, you can the plug anything into that ethernet port, to access the internet. So what I am trying to confirm is if I buy an Express, change the mode to Join, then plug the ethernet port into the WAN port on my Extreme, will I be able to create my own secure wireless network using the Express internet connection provided to it wirelessly? See, I could easily just jump onto the building wifi with all my devices, but there are thirty other tenants, and worse, the password they use has gotten on the the streets, so it is very insecure. I want to create my own personal network but still use their internet connection, with my own password and SSID. Any help is greatly appreciated! Thanks!