We're currently running Windows Server 2012 R2 for our web server, using IIS 8.5. Is it possible to upgrade that to IIS 10 for HTTP/2 or otherwise enabled HTTP/2 on our current install?
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No, IIS is a integrated part of the OS and can't be separately upgraded to a newer version. HTTP/2 especially isn't implemented in IIS, but in a kernel mode driver that is naturally only available in Win 10/2016.
Note: IIS 10 Express exists (and can be installed on that OS), but this is a testing/development server not meant for production use.