This ^^^ I work in network and communications, and if I'm not mistaken, WEP was depreciated like 10 years ago or something.
If you aren't involved in IT decisions at your workplace, I would say there's not much you can do, but if you are and your infrastructure and clients support it, I would recommend switching to WPA2... If you have some really old legacy equipment using wifi this might be an issue, but I'd definitely look into it if it's a possiblity... (plus hey, your WP8 device will work!)
If changing the entire WLAN at your workplace is going to be an issue, it is also possible your hardware supports a virtual AP; essentially what this would do for you is allow your radios to broadcast two separate networks, and you could turn up a separate SSID with WPA authentication for use with your phone.
As a disclaimer this is being said with no idea as to what kind of infrastructure and hardware you have at your company, nor your ability to make infrastructure related decisions, but that is my $0.02.