But a major concern is that choosing IIS necessitates also picking Windows, with its attendant high cost and security implications compared to Linux.

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Depending on the data source, they are two of the most common web server platforms, comprising a virtual triumvirate with Nginx for control of the market.

In fact, IIS vs. Apache flame wars are many times really spillover or proxy tirades of Microsoft vs.

Linux. A compare-and-contrast exercise between the two web servers should be as objective as possible, which is what well try and do here and not get drawn into personal preferences and emotional-laden outbursts.

What is IIS IIS (Internet Information Services) is Microsofts web server offering, playing second fiddle to market leader Apache.

As is expected of a core Microsoft product, it only runs and is bundled on Windows operating systems, but is otherwise free for use.

It is a closed software product and supported by solely by Microsoft.

Although development is not as open and quick as the open-source user-supported nature of Apache, a behemoth like Microsoft can throw formidable support and development resources at its products, and IIS has fortunately benefitted from this.

Actually it is one of the few Microsoft products that even its detractors (grudgingly) agree can stand toe-to-toe with its open source rival and even trounce it soundly in some areas.

There is a lite version called IIS Express that has been installable as a standalone freeware server from Windows XP SP3 onwards.

Solid feature, performance and security improvements over the years have meant that IIS has steadily improved and gained ground and market share on Apache.

Security has been one area of significant gain, making huge leaps from the days of IIS 6.0s vulnerability to the infamous Code Red worm.

Still, the IIS-Apache security comparison may not be fair to IIS.

IIS vulnerability may also be largely blamed on its operating system parent since most malware targets Windows, and Linux (Apaches main choice of OS) is itself an offshoot of the inherently iron-clad Unix OS.

Like Apache, IIS also utilizes external web extensions to implement some features.

For example FTP publishing, application request routing, media services and URL rewriting are all new features introduced in IIS 7.5 via extensions.

And IIS offers strong support for the Microsoft products.NET (framework) and ASPX (scripting), so if your website relies heavily on these, IIS is a clear frontrunner as a choice of web server.

And IIS offers in-depth diagnostic tools such as failed request tracing, request monitoring and runtime data, in addition to virtual hosting support.

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