While deploying a new Skype for Business Server 2015 Pool in the lab we got the following error message in the Deployment Wizard Step 2 (bootstrap): Installing rewrite_2.0_rtw_x64.msi( REBOOT=ReallySuppress )...failure code 1603 -------------------- Error Message from rewrite_2.0_rtw_x64.msi---------------------------- Property(S): TTCSupport = 1 Property(S): Time = 11:25:19 Property(S): Date = 4/10/2020 Property(S): MsiNetAssemblySupport = 4.6.1586.0 Property(S): MsiWin32AssemblySupport … Continue reading SfB Server 2015: Prerequisite installation failed: RewriteModule…failure code 1603