I once worked in a hosting environment where we had many thousands of websites per physical web server host. I was witness to much of the fun with that sort of scale on IIS.
Windows Server 8 brings a lot of improvements to IIS 8, particularly for spinning up websites and SSL scalability (SSL doesn’t require dedicated IPv4 per site) and manageability (SSL certs on the file system and import via copy).
You can find out more at:
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