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The final result of a build should not be just ZIP file, but (optionally) also RPMs, solaris packages, windows packages (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/about_windows_installer.asp).
RPMs and Solaris packages are now being built in 4.1 daily builds. Please file separate issue against installer module to get MSI installers.