Live Communications Server 2005 Service Pack 1 for Standard and Enterprise Editions

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Microsoft Office Live Communications Server 2005 with SP1 further improves business efficiencies by enabling information workers to communicate and share presence information with contacts in real time, through a security enhanced, enterprise-grade, integrated environment.
  • Note:There are multiple files available for this download.Once you click on the "Download" button, you will be prompted to select the files you need.


    File Name:



    Date Published:


    File Size:

    23.5 MB

    23.5 MB

      Live Communications Server 2005 SP1 improves on the features of Live Communications Server 2005 by extending the federation model, enhancing functionality, increasing security, and improving performance and infrastructure support. These improvements include:
      • Tools to enable Public IM Connectivity; the ability to add contacts, send instant messages, and share presence information with users of the three main public IM service providers MSN, AOL and Yahoo!.
      • Enhanced federation, which uses DNS-SRV resolution to simplify connecting to federation partners.
      • New optional spim filters for better control of unsolicited instant messages.
      • Support Microsoft Office Communicator 2005.
      • Support for multiple tree Active Directory forests.
      • Improved server API performance.

      You can get specific information about this update in the Microsoft Knowledge Base article (897690): Description of Live Communications Server 2005 Service Pack 1.

      Live Communications Server 2005 SP1 is available in two editions: Standard Edition and Enterprise Edition.

      Live Communications Server 2005 SP1 for Standard Edition
      Downloadable file name: LCS2005_SE_SP1_Upgrade.exe.

      Consists of single, stand alone IM and presence server together on the same computer with an MSDE (Microsoft Desktop Engine) database for storing user data. It supports up to 15,000 concurrent users and is the appropriate choice in small deployments where enterprise-level capacity, availability and performance are not required.

      Live Communications Server 2005 SP1 for Enterprise Edition
      Downloadable file name: LCS2005_EE_SP1_Upgrade.exe.

      Consists of a pool of servers connected to a separate, shared SQL Server database that supports up to 100,000 users. This two-tier architecture, delivers substantial improvements in availability, scalability, and performance than the Standard Edition.

      • This upgrade is only for the English version of Live Communications Server 2005 Enterprise or Standard Editions.
      • This service pack will not support the upgrading of MSDN versions of Live Communications Server 2005 Enterprise or Standard Editions.
      • In order to update to Live Communications Server 2005 with SP1, you must update all servers within your Live Communications Server 2005 topology.
      • Public IM Connectivity requires a per-user; per-month subscription license that is in addition to the Live Communication Server Client Access License (CAL).
  • Supported Operating System

    Windows Server 2003

      • This service pack requires the following program:
        Fully licensed version of Microsoft Office Live Communications Server 2005 Enterprise or Standard Edition.
      • Client Software Requirements:
        While Windows Messenger 5.1 supports basic presence and IM scenarios, the recommended client for Live Communications Server 2005 and public IM connectivity is Microsoft Office Communicator 2005. For more information, visit

    • To help ensure that you have access to and can use the most updated product documentation while planning, deploying, and maintaining your Live Communications Server environment, this download does not contain copies of the product documentation.

      To download and use the most recent documentation, please visit the Live Communications Server deployment resources center at and click the link to the specific product documentation that aligns with your deployment phase.

      To install this download:

      Prior to installing this download, you must install all Security Patches from the Microsoft Windows Update site.
      1. Download the appropriate file(s) by clicking on the links below and saving the file(s) to your hard disk.
      2. Read the release notes for SP1 to ensure a successful SP1 installation.
      3. Double-click the program file on your hard disk to extract the Live Communications Server 2005 SP1 Upgrade files.
      4. From the directory where you extracted the files, go to \Setup\I386 and start the Setup program.
      5. Follow the instructions on the screen to complete the installation.

      To remove this download:

      To remove the download file(s), delete the files LCS2005_SE_SP1_Upgrade.exe or LCS2005_EE_SP1_Upgrade.exe.

      To uninstall the software involves performing two steps on the Live Communications Server software: deactivate and uninstall. These steps are outlined in detail in the Live Communications Server Deployment Guide available at
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