The upgrade to PHP 5.2.6 was completed a few hours ago, and so far there does not seem to be any adverse affects.
PHP 5.x not only provides literally hundreds of new features, but is also significantly faster than the 4.x branch of PHP. This upgrade will give Mr.Host customers access to some of the more cutting edge web-based applications, as well as allow them to build more dynamic, feature-rich websites.
If you’re experiencing any adverse affects from this upgrade, or have any questions or concerns, please don’t hesitate to contact us directly.