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It adds quite a bit more administrative control. EAS (Exchange ActiveSync) protocols on Android 3.x tablets and on smartphones with Android 4.0 enable the "device administrator" to function for remote control of some Android security features, such as the ability to wipe all data, set password rules, monitor screen-unlock, et al. It also adds support for VPN, something that was previously only found in Android tablets. I believe it also will give admins the ability to disallow installation of non-Android Market apps, which is a good thing, but of course that doesn't eliminate the potential presence of malware apps that sometimes make it onto the Android Market itself.