We wanted to let you know that GoZen Host will be undertaking a rolling project to upgrade our shared server fleet's PHP version to 5.3.13 and MySQL to version 5.1.
These versions come up with a number of performance enhancements and new features for developers. You can read about them on the following sites:

MySQL 5.1 - http://dev.mysql.com/doc/refman/5.1/en/
PHP 5.3X - http://php.net/releases/5_3_0.php
PHP 5.3.13 - http://www.php.net/archive/2012.php#id2012-05-08-1

We do not anticipate any significant issues with regard to the MySQL upgrade, and for most installations, we do not anticipate any issues with the PHP5.3.13 upgrade.
For some customers running old versions of software that have not been upgraded, custom software that was written around a 5.2 architecture and not upgraded to be compatible to 5.3, or customers running current software with older plugins, this PHP upgrade could have a detrimental affect on your site's functionality if you have not ensured your site is compatible with PHP 5.3.
Because of the potential for a minority of infrequently updated or outdated sites to have some problems with the upgrade, we will be updating our server fleet in waves, or clusters, so that only a small number of customers are affected at any one given time.
We are upgrading in this manner to ensure that we can give any customer that has issues stemming from the upgrade the help they need to understand what the issue is with their software/its incompatibility, as well as guidance on what needs to be accomplished in order to bring it into compliance or if that is not possible what their options are.
These upgrades will begin July 18th, and will continue Monday through Friday, ending on 25th of July.

Please let us know if you have any questions.