I then proceeded to install all of the Windows updates.
I installed Exchange 2010 SP3 without a problem.
When I attempt to install any roll-ups, I get the error 1603. In the MSI log, it indicates ‘not compatible‘ version or a ‘interim‘ was installed and it needs to be removed. See below.
‘The version of this file is not compatible with the version of Exchange Server 2010 that you’re running. Check your computer to see whether you need an x64 (64-bit) or x86 (32-bit) version of this file.
PUnable to install because a previous Interim Update for Exchange Server 2010 has been installed. Please use Add/Remove Programs to uninstall the Interim Update before running this setup again.’