O&O Defrag 18 Product manual

O&O Defrag 18 
System requirements

  • The system requirement of each operating system have to be fulfilled
  • 50 MB free hard disk space
  • 32/64-bit Support (from Windows XP/Server 2003)
  • Windows® Vista till Windows® Server 2012 (all editions):

Supported operating systems

Operating system


Professional Edition


Workstation Edition


Server Edition


Windows 8 yes yes yes
Windows 7 yes yes yes
Windows Server 2008 no no yes*
Windows Vista yes yes yes
Windows Server 2003 no no yes*
Windows Server 2008 R2 no no yes*
Windows Server 2012 no no yes*

* All variants of this server operating system are supported, except Core-Installations

If you wish to use the network functionality, you must also have the following available:

  • Network card and connection

Access permissions

You need local administrator permissions for the installation and for its later use. This is usually the case, if you were able to install other programs before.

In a network, you must be the domain administrator if you wish to install and control O&O Defrag locally as well as on the network computers.

Microsoft Windows Installer

The installation takes place with the help of the Microsoft Windows Installer. It is a Windows integrated component which controls all installation and uninstallation.