Users are strongly recommended to always continually upgrade and use the latest version of Nx Witness.
Windows* Vista, 7, 8,10
Windows Server 2003, 2008, 2012
*Nx Witness v2.6 ends support for Windows XP OS, which Microsoft officially quit supporting in April of 2014.
Ubuntu 10.04 LTS, 12.04 LTS, 14.04 LTS
Mac OSX 10.8 or later.