Driver for Telstra NextG Qualcomm 3G 1201420 (Aircard 880U)
If you’re looking for a driver for this obscure beastie, try http://www.telstrabusiness.com/business/portal/online/site/help/mobilebroadbanddownloads.10726 or http://www.sierrawireless.com/en/sitecore/content/Sierra%20Wireless/Support/Downloads/AirCard/Legacy_Products/AirCard_880U_for_Telstra.aspx
Not sure if it works with Windows 7 64 bit yet.