According to Infonetics, only three enterprise telephony vendors posted year-over-year gains in revenue during 2012. Mitel, Cisco, and ShoreTel. It is hard to attribute success to any one component of a business strategy, but the commitment to virtualization certainly played a major role for Mitel.
Dave is an independent analyst and founder of TalkingPointz which is focused on enterprise communications. In addition to this (free and paid) content on TalkingPointz, he contributes to industry sites, can be found at major industry events, and provides advisory services to vendors and financial analysts.