Microsoft Lync (formerly Microsoft Office Communicator) and Microsoft Communicator for Mac are instant messaging clients used with Microsoft Lync Server and are replacements for Windows Messenger which was used with Exchange Messaging Server.
Microsoft Lync (formerly Microsoft Office Communicator) and Microsoft Communicator for Mac are instant messaging clients used with Microsoft Lync Server or Lync Online available with Office 365 and Live@Edu. They are replacements for Windows Messenger which was used with Exchange Messaging Server.