For maximum performance and scalability, it is recommended that you modify the Internet Information Service (IIS) thread limits after creating a Communicator Web Access (2007 R2 release) virtual server. This is especially important if your Communicator Web Access server will need to handle more than just a few hundred simultaneous connections.
To configure virtual server thread settings
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Log on to the computer that is running Communicator Web Access as a member of the local Administrators group and the RTCUniversalServerAdmins group.
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Click Start and then click Run.
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In the Run dialog box, type wbemtest and then press ENTER.
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In the Windows Management Instrumentation Tester, click Connect.
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In the Connect dialog box, type root\default\rtccwa_repository in the Namespace box, and then press ENTER.
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In the Windows Management Instrumentation Tester, click Open Class.
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In the Get Class Name dialog box, type MSFT_CWASiteSetting in the Enter Target Class Name box, and then press ENTER.
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In the Object Editor for MSFT_CWASiteSetting dialog box, select Hide System Properties and then click Instances.
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All of the virtual servers installed on the computer will be displayed in the Query Result dialog box. To view the properties for a particular virtual server, double-click the server name.
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In the Object Editor dialog box, select MaxThreadLimit and then click Edit Property.
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In the Property Editor dialog box type 12 in the Value box and then click Save Property.
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In the Object Editor dialog box, select MinThreadLimit and then click Edit Property.
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In the Property Editor dialog box, type 3 in the Value box and then click Save Property.
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In the Object Editor dialog box, click Save Object.