For a long time, Microsoft’s Dotnet development platform has dominated the IT market. A lot of business applications and enterprise systems with high end customizations have been developed in Dotnet. But now the market has moved on to open source frameworks.
PHP based open source frameworks like WordPress, Joomla, Drupal have already attained tremendous popularity over a very short time. Things like open source nature, readily available plug-ins, customizable modules, support from developer forums, etc have further fueled this popularity.