O&O Defrag
| O&O Defrag | |
|---|---|
O&O Defrag 14 Professional Edition running under Windows 7 | |
| Developer(s) | O&O Software |
| Stable release | 28.0.10005
/ March 19, 2024 |
| Operating system | Windows NT |
| Type | Defragmentation |
| License | Shareware |
| Website | oo-software |
O&O Defrag is a Windows defragmentation utility sold by German software developer O&O Software. It has won several awards by PC journals and magazines, and is certified by Microsoft for all its current NTFS-based operating systems, including NT 4.0, 2000, XP, Vista, 7, 8, 8.1, 10, 11, Server 2003, 2008, 2008 R2, 2012, 2012 R2, 2016, 2019 and 2022.