Ok here goes. I recently (last night) got a Airport Extreme from eBay. Origionally brought in November 2008 gigabit model. I updated the firmware to the latest version (7.4.##) and set the network up. I then plugged in my WD mybook and set it up thorugh airdisk, again not a problem. I then entered my mobileme credentials in the appropiate section to share the disk over the web. I've come into work today with my macbook and cant see my disk in finder or my Airport Extreme in the airport utility. I only have 1 mac. I have my airport extreme connected to my Virgin Media (UK) cable modem via ethernet. Now, have i missed out anything? At work we use a http proxy for port 80 but i have configured this on my macbook and can use my macbook to connect to the internet and browse the network etc... any help would be appreciated.