UC will have an impact on all aspects of business activities, including reaching customers. Many tradtional location-based tradeshows will also be affected, and Apple's recent MacWorld departure is evidence that the tradeshow world, with the help of the Internet and UC,  will be changing dramatically for the better.
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http://www.ucstrategies.com/unified-communications-strategies-views/the-future-of-uc-tradeshows.aspx
