The wireless middleware market is set to explode, but to take advantage will require heavy investment from the players, in acquisitions and in strong Wi-Fi enablement of older product sets. Most contenders have come from a heritage of providing synchronized links between mobile users on laptops or PDAs to corporate email servers. Now full wireless access is the key, and enterprises are starting to build a broader set of applications around their mobile information servers, with field workers accessing all kinds of corporate information via the Wi-Fi or cellular connection. This trend will create a 36.5% compound annual growth rate in the mobile middleware sector, according to IDC predictions, and revenues of $1.6bn by 2007. Average seat deployment is rising…