The primary installation file for Office Communications Server is the Server.msi file. This file installs or uninstalls Standard Edition, Enterprise Edition, Proxy Servers, and Edge Servers. As mentioned earlier, the command-line parameters you supply when you run an .msi file are for the MSIExec application, not the .msi file. This is not entirely true. Because the same setup file is used for all of these servers, Server.msi has its own set of parameters:

Launch Server.msi with the following syntax.

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MsiExec.exe /i Server.msi SERVER={SE|EE|AP|PROXY} SKU={SE|EE}
[Optional Msiexec.exe Parameters]

Such as:

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Msiexec.exe /i Server.msi SERVER=SE /l*v C:\SE.log


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Msiexec.exe /i Server.msi SERVER=PROXY SKU=SE /l*v C:\Proxy.log

An installation wizard appears and prompts you through the process.

Installation requires Unified Communications Managed API 2.0 Redistributable and Microsoft Office Communications Server Core Components to be installed in advance. From within the Office Communications Server installation disc, locate and run both UcmaRedist.msi and OCSCore.msi.