Other client software and devices include: This requires an additional server or multiple servers for processing group chat transactions. Persistent Group Chat functionality (introduced with Lync Server 2010) is only supported on the Windows OS client at this time. This is a version of the Lync more oriented towards receptionists or delegates / secretaries or others who get a large volume of inbound calls. Microsoft also ships the Microsoft Attendant Console. With Lync 2013 there will be a release of Lync Light Client with fewer features. This client is used for IM, presence, voice and video calls, desktop sharing, file transfer and ad hoc conferences. Microsoft Lync is the primary client application released with Lync Server. 2005 - Live Communications Server 2005, codenamed Vienna.2006 - Live Communications Server 2005 with SP1.2007 - Office Communications Server 2007.2009 - Office Communications Server 2007 R2.

2018 - Skype for Business Server 2019 (due end of 2018).Microsoft has stated that general availability for Skype for Business Server 2019 is targeted for the end of 2018. In 2015, the new version of Lync become Skype for Business with a new client experience, new server release and updates to the service in Office 365. Microsoft Lync 2013 was released to manufacturing in October 2012 with SP1 being released in March 2014. Microsoft Lync Server 2010 reached general availability in November 2010. Persistent Group Chat (only available on Windows OS clients).The R2 release added the following features: Microsoft released Microsoft Office Communications Server 2007 R2 in February 2009. OCS R2 was announced at VoiceCon in Amsterdam in October 2008, a year after releasing Office Communications Server 2007. Holders of Exchange 2000 licenses which included Software Assurance were entitled to receive Live Communications Server as an upgrade, along with Exchange 2003 however, Live Communications Server Client Access Licenses were purchased as normal for new users. When Microsoft Office Live Communications Server was originally launched on 29 December 2003, it replaced the Exchange Instant Messenger Service that had been included in Exchange 2000, but which was removed from the Exchange 2003 feature set. HP has implemented OCS on its Halo video conferencing platform. Several third parties have incorporated Lync functionality on existing platforms. Remote access is possible using the desktop, mobile and web clients. The other major components are VoIP telephony and video conferencing through the desktop communicator client. IM is only one portion of the Lync suite. Microsoft has published details of supported configuration for qualified vendors through Unified Communications Open Interoperability Program (UCOIP). By default, supported combinations include encrypted communications using SIP over TLS and SRTP as well as unencrypted SIP over TCP and RTP. The communicator client also uses HTTPS to connect with the web components server to download address books and expand distribution lists. The live meeting client uses Persistent Shared Object Model (PSOM) to download meeting content. Microsoft Lync Server uses Session Initiation Protocol (SIP) for signaling along with the SIMPLE extensions to SIP for IM and presence. Federation can be configured either manually (where each partner manually configures the relevant edge servers in the other organization) or automatically (using the appropriate SRV records in the DNS). Lync supports identity federation, enabling interoperability with other corporate IM networks. mobile or home workers) as well as users in partner companies. Lync Server also supports remote users, both corporate users on the Internet (e.g. Lync uses Interactive Connectivity Establishment for NAT traversal and TLS encryption to enable secure voice and video both inside and outside the corporate network. This includes support for rich presence information, file transferand voice and video communication. One basic use of Lync Server is instant messaging (IM) and presence within a single organization.

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