Transcribo: Microsoft's UC solution is based on Exchange Server, OCS and Active Directory. Microsoft has strategic partnerships with Aspect and HP, along with a large and growing set of partnerships for gateways, survivable branch appliances, IP phones, audioconferencing service providers and SIP trunking, along with major system integrators and channel partners. OCS also integrates with collaboration and business applications like SharePoint. The same OCS and Exchange application is also used...