Unison is unified communications software that replaces legacy systems like e-mail servers, instant messaging servers, and the PBX. Instead of deploying multiple non-unified IT systems for your company communications, simply deploy a Unison Server, then install Unison Desktop for each member of staff at your company. The Unison Server handles all telephone calls and routing, e-mail, instant messages, calendars and contacts and distributes them to your employees. Unison Desktop, which runs on Windows or Linux, gives your users fully-unified communications (telephony, email and more) in a single 'fat client' interface on their desktop.