How to create IIS (webserver) cluster / Highly Available IIS for Exchange Services (ARR)

Ok, so in my previous guide we made Exchange OWA/Autodiscovery highly available via ARR which is module inside IIS. We installed ARR inside separate VM in DMZ and everything is working nice. But, now we have machine with IIS and ARR on it as single point of failure. We now need to make our IIS highly available, so if we need to for example apply patches to it, our Exchange services don’t go down.

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