s to corporate e-mail, it also enabled the device to automatically synchronize e-mail and applications such as calendars with corporate servers. The BlackBerry is still a widely used smartphone for corporate applications. But, employees now often bring their own personal tablets and mobile handsets to work. addition to accessing e-mail, they also often require access to corporate files stored on intranets. This creates security risks because not all of these devices support encrypted access or IPsec VPNs. For more information about VPNs, IPsec, and intranets, see Chapter 6, "The Internet." Another issue in supporting mobile devices in corporations is managing the billing and support for mobile services. Support involves negotiating contracts with providers, correcting billing errors, ensuring that employees who leave the company turn in their handsets, and replacing damaged or out-of-date devices. It also involves the ability to remotely kill (disable) or lock lost or stolen mobile equipment and wipe sensitive data from their memory. All of this entails enormous amounts of staff hours, help-desk time, and expertise. To ensure security and streamline these operations, companies are outsourcing the management of the billing and procurement process. They are additionally acquiring servers that support encryption and integration with Microsoft's e-mail and synchroni- zation for many types of operating systems and devices, including Google's Android, Apple's iOS4 and iOS5, Microsoft's Windows, and RIM's BlackBerry operating sys- items. They additionally can be used to manage the distribution and security of apps made especially for enterprises. Servers that support multiple operating systems are referred to as multi-platform mobility solutions or enterprise mobility platforms. Organizations have the option to obtain these platforms from a single vendor such as Good Technology or from two developers. One might offer a server to manage security and integration with Microsoft Office software. The other vendor would manag