Technical requirements

Server:
For 30 users:
CPU: 2 x Xeon DualCore @ 2,0GHz
RAM: 2GB
HDD: 2 x 70 GB SAS HDD

For 100 users:
CPU: 2 x Xeon Quad Core @ 2,33 GHz
RAM: 4GB
HDD: 2 x 70 GB SAS HDD + 500GB HDD SAN (SATA)
System: Debian 4 / Red Hat Enterprise Linux 5 (or other Linux)

Database
MySQL Community Server
minimum required version: 5.0.1
recommended version: 5.0.45

Web Server
Apache HTTP Server
minimum required version: 2.0.61
recommended version: 2.2.6

The Apache HTTP Sever also requires the non-standard extensions for the purpose of cooperation with SVN. These extensions are as follows:
mod_authnz_external: 3.1.0
mod-dav-svn: version related with SVN distribution

Scripting support
The possible and the currently supported versions of the PHP solution are:
minimum required version: 5.1.6
recommended version: 5.2.4

yPublisher Portal also requires the PHP extensions, which are available in the default extensions pack, as well as non-standard extensions. Those additional libraries are:
Default PHP extensions:
php_mysql: version related with PHP (e.g. for PHP 5.1.6 -> 5.1.6.1)

SVN
The possible and the currently supported versions of the PHP solution are:
minimum required version: 1.4.0
recommended version: 1.4.5

yPublisher also requires the installation of the SVN client on the server machine:
SVN client
version related with SVN distribution

Author:
CPU: Pentium IV 2,0 @ 2GHz
RAM: 1GB
HDD: 120GB
Screen resolution: 1024x768 (recommended 1280x1024)
System: Windows 2000/XP/Vista
Web browser: Internet Explorer 6.0.2800 or higher; Mozilla Firefox 1.5.0 or 2.0.0
Third-party software: Java runtime environment 1.6 (SUN), Flash Player 9

Client:
CPU: Pentium IV 2,0 @ 2GHz
RAM: 1GB
Screen resolution: 1024x768
System: Windows 2000/XP/Vista; MAC OS; Linux
Web browser: Internet Explorer 6.0.2800 or higher; Mozilla Firefox 1.5.0 or 2.0.0
Third-party software: Flash Player 9