Group chat deployment supports both a single server

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Group Chat deployment supports both a single-server deployment and a multiple-server configuration. A common Group Chat database is used for either single-server or multiple-server deployments. With multiple Group Chat Servers, the Lookup service and Channel service communicate amongst the Group Chat Servers to ensure that a chat room that was initiated on one server is available for participants in that chat room on any Group Chat Server. It is important to note that all Group Chat Servers in a multiple-server environment are on the same subnet. Group Chat is not supported in a topology where the Group Chat Servers are located on separate local area network subnets. Configuration of server settings must be done on the local Group Chat Server. Global settings that affect all settings on the collection of Group Chat Servers can be done on any server in the pool. For details about deploying and configuring Group Chat, see the Deploying Group Chat Server documentation. Best Practices Deploy Group Chat Servers in a physically secure environment. 41
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Microsoft Lync Server 2010 Security Guide Use certificates from your internal CA, or public certificates issued from a unified communications-certified CA. Use guidance from the Security Guides for the server operating system of the Group Chat Server and the database server to reduce the attack surface. Ensure that all clients and servers are kept patched and up to date with the latest service packs. Addressing Threats to Lync Web App In Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2, Communicator Web Access is a specialized Web server that allows for instant messaging, Web conferencing, desktop sharing, and dial-in conference support for internal and external users who do not have access to Microsoft Office Communicator or cannot use the full client due to protocol or desktop limitations. In Microsoft Lync Server 2010, Communicator Web Access functionality still exists but has been renamed Microsoft Lync Web App. The browser- based Lync Web App client does not have the full Lync functionality of Lync. For Windows users, all the in-meeting features are available, except for computer audio, video, and the ability to upload Microsoft PowerPoint presentations. The same features that are available to Windows users are also available to Macintosh users, with the exception of desktop and program sharing. Lync Web App Lync Web App is automatically installed as part of a Standard Edition server and on each Front End Server in a Front End pool, rather than a dedicated physical server. For details about Lync Web App functionality, see Lync Web App Features in the Getting Started documentation and What's New in Client Deployment in the Planning documentation. You configure virtual servers to accommodate both internal and external user types. The virtual servers are separated in such a manner that external users are only allowed access to the external virtual servers, and likewise for the internal user and internal virtual servers. However, it is possible to use a single virtual server for both internal and external access.
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