Unified communications is one of the most promising of all horizontal applications for productivity enhancement because it supports the key activities of customer/sales support, team building for projects and general business communications. It's also an application that has been battered by competitive positioning, vendor consolidation and a host of industry forces. How it reacts to these pressures will determine the form unified communications (UC) will take in the coming decade, and many UC issues will be highly visible in 2010. Here, in inverse order of importance, are the top five unified communications issues for the year.