You attempt to install the Exchange Database iDataAgent with the CommVault Simpana 9.0 R2 installer on Exchange Server 2013 but notice that the option grayed out:
Hovering over the option displays the following message:
Provides backup and recovery of Microsoft Exchange databases.
This platform is disabled because:
It requires a supported version of Microsoft Exchange.
As per the CommVault SP3 notes:
… to add support for Exchange Server 2013, you will need to create the following registry key:
Note that I had to create the GalaxyInstallerFlags key as it did not exist. Once the key and dword is created, restart the installer and you should see the Exchange Database iDataAgent available: