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I would like to check if my VM is installed with IIS. Which method is more accurate?

1. Registry Editor

Check for regfolder and regkey
HKLM\Software\Microsoft\Inetstp -> Folder must exist
HKLM\Software\Microsoft\Inetstp\VersionString -> Value must be valid


2. Get-WindowsFeature

PS > (Get-WindowsFeature Web-Server).InstallState -eq "Installed"

For Get-WindowsFeature, some VMs reply back with InstallState as "Available". Does it mean the same?

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The supported method is with Get-WindowsFeature, because the registry keys can change at any time.

"Available" means that the feature is available for installation but is not installed

Get-WindowsFeature
Gets information about Windows Server roles, role services, and features that are available for installation and installed on a specified server.

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  • Consider the fact that installers of all official IIS OOB components check the registry key, I don't think that's "not supported".
    – Lex Li
    Oct 10, 2019 at 21:37

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