Microsoft OCS R2 in clear PBX play
"With our existing Microsoft installed base, Office Communications Server was the most economical way to change out about 490 legacy PBXs. Other unified communications options required substantially more infrastructure. Office Communications Server allowed us to leverage our existing Microsoft infrastructure and provide employees with affordable headsets for voice calling."
"Microsoft is solving enterprise communications problems differently. It looks to me like they asked themselves the question: What would be the best way to deliver communications for a "people-ready business" that would reduce costs, improve business outcomes and provide both productivity and control to the users? If the new software also fills in the PBX checklists, that's so much the better."