Also ensure your users have a wireless firewall/VPN to protect them and to manage encrypted VPNs from the wireless device. Companies such as WatchGuard and Check Point provide centrally manageable solutions in this area.
Bear in mind that many cheaper remote firewalls are incapable of dealing with application level attacks. A key requirement for remote firewalls, wireless or static, is to be able to deal with current and future threats, which include packet and, increasingly, application level attacks. All of these measures should greatly improve your mobile computing security with the minimum of fuss and resistance from staff.
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