From the Internet revolution has emerged a more subtle evolution, one of the few that could affect midsize businesses even more than enterprise companies. This is the new era of unified communications — the convergence of software, hardware, and network technology to enable companies to optimize business processes and provide employees with a seamless, integrated communications system.
In Summary:
• Migrate to a combined voice and data network only when an event such as a move or lease expiration makes it economically feasible.
• Unified communications can save money on telephone charges and by managing a single network versus multiple networks.
• Internet Protocol (IP)-based messaging and collaboration applications can improve employee and call center productivity.
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Source: Microsoft.com