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Web Platform Installer
Developer	Microsoft
Initial release	January 21, 2009 (2009-01-21)
Final release	5.0 / February 14, 2013; 13 years ago (2013-02-14)[1]
Operating system	Windows XP SP3 and later Windows Server 2003 SP2 and later[2]
Platform	x86-64,IA-32
Size	4.5MB
Available in	14 languages[1]
List of languages English, German, Japanese, French, Spanish, Italian, Korean, Chinese Traditional, Chinese Simplified, Czech, Polish, Portuguese-Brazil, Russian, Turkish
Type	Package management system
License	Freeware
Website	www.microsoft.com/web/downloads/platform.aspx

Web Platform Installer (Web PI) is a discontinued freeware,closed-sourcepackage management system developed byMicrosoft that installs non-commercial development tools and their dependencies that are part ofMicrosoft Web Platform, including:

• Internet Information Services^[3]
• WebMatrix^[4]
• Visual Web Developer Express Edition^[3]
• Microsoft SQL Server Express Edition^[3]
• .NET Framework^[4]
• Silverlight Tools forVisual Studio^[5]
• PHP^[6]
• WordPress^[7]
• Umbraco^[8]
• Drupal^[9]
• Joomla!^[10]
• Orchard^[11]

Microsoft announced Web PI in October 2008 and offered for download arelease candidate build of the software the following month.^[12][13] The company released version 1.0 of Web PI on January 21, 2009.^[14] The ability to install third-party software was added in version 2.0, released September 24, 2009.^[9][15] As of July 2015^[update], Web PI can install 82 titles.^[16] Web PI 2.0's options are populated dynamically at runtime from Microsoft's servers, allowing installation options to be updated without the need to download newer versions of the Web PI itself.^[17]

In 2010, Microsoft announced Web PI 3 which includesWebMatrix, a new set of integrated tools for web development. Web PI 3 installs additional tools for web development including IIS Developer Express,SQL Server Compact andDotNetNuke.^[18][19]

Web PI features an offline mode where products can be downloaded to a local cache on a machine where internet access is available and then use these cached files on a different machine later.^[20] However, Web PI is still not usable in environments where Internet connectivity andlocal administrator privileges are mutually exclusive (i.e. a givenprocess can either authenticate through atransparent proxy, or can have High or Systemintegrity level, but not both).

InfoWorld writer Serdar Yegulalp called Web PI most comparable with Softaculous'sAMPPS and wrote that, while not fully compatible with theWAMP model on account of lacking support for installingApache HTTP Server, it came close by "help[ing] accelerate Web development on Windows platforms by deploying many non-Microsoft stack elements" such as PHP,Perl, andMySQL. He liked its ability to work as astaging server but took umbrage with its inability to locally edit remotely published sites not themselves deployed from Web PI.^[19]

The Microsoft Web Platform Installer (WebPI) has been retired since July 1, 2022.^[21]

• Solution stack: set of software subsystems or components needed to create a complete platform
• Windows Package Manager: an open-source package manager forWindows 10 andWindows 11

• Official website
• Introduction to WebPI and WebPI Command-Line Utility

• Discontinued Microsoft software
• Microsoft development tools
• Proprietary package management systems
• 2009 software

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• All articles needing rewrite
• Articles containing potentially dated statements from July 2015
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