The Hiptop software was designed by Danger, Inc., which was located in Palo Alto, California and purchased by Microsoft for $500 million in 2008. Danger provided the Hiptop OS software and back-end services for the device. This included a catalog of downloadable software applications, email hosting, instant messaging, web proxies and a cloud service for the entire personal data on the device. The original Hiptop hardware was designed by Danger and manufactured by Flextronics. The Hiptop II, 3, Sidekick iD, Sidekick 2008 and Sidekick LX (2009) are all manufactured by Sharp Corporation in Japan and designed, respectively, by Danger and then Danger in partnership with Sharp. All versions of the Hiptop were developed in close partnership with T-Mobile, although carrier-specific features were either removed or added for each carrier, such as the addition of MMS for SunCom and Telstra Hiptop 2 users, where the feature was not available on T-Mobile USA devices until the Sidekick LX in 2007.