O&O Defrag 2000 is a freeware Windows defragmentation tool. It is completely integrated into the Microsoft Management Console as a snap-in and can be used to replace the standard Windows 2000/XP defragmentation software.
| Version | Freeware |
| Operating System Support | Windows 10, Windows 2003, Windows XP, Windows 98, Windows 2000 |
| Current Language | English |
| Available Languages | English, French, Polish, Chinese, Italian, German, Japanese, Spanish |
| License | Free |
| Date | Monday, October 24th 2005 |
| Developer | O&O Software |
| Developer URL | https://www.oo-software.com |
Partitions can be analyzed and manually defragmented with the SPACE defragmentation function. You have now the possibility of showing clusters in the “faded” mode: the clusters are displayed in a brighter or darker color according to how full they are and their content. With the Cluster Inspector you can view the cluster contents and display fragmented files.