Today the most sophisticated smart phones, and even some Pocket PCs and Portable Media Centers, run on Windows Mobile Operating System from Microsoft. Last year Microsoft’s mobile shipment almost doubled, signifying that demand for Windows Mobile powered smart phones has significantly increased, and will continue to do so over the years. Currently in version 6.1, Windows Mobile can be thought of as a scaled down version of the popular Windows Operating System. It has the mobile versions of the popular Microsoft Office suite, and also the Outlook mobile, the very popular email client. For various multimedia uses, it bundles Windows Media Player. For internet browsing, it has a mobile version of Microsoft Internet Explorer. It has a taskbar similar to the one found in the Desktop version of the Windows Operating System. A user can access the device’s various programs and options using the taskbar, similar to the desktop version. HTC Corporation is currently the biggest major smartphone manufacturer which uses Windows Mobile.