On utilisant le telnet sur le port 25, on peut trouver IIS.
5.0.2195 – Windows 2000
6.0.3663 – Windows 2003 RC1
6.0.3718 – Windows 2003 RC2
6.0.3790 – Windows 2003 RTM
Et pour Exchange
6.0.6249.0 – Exchange 2000 SP3
6.5.6728.0 – Exchange 2003 Beta 1
6.5.6803.0 – Exchange 2003 Beta 2
6.5.6851.0 – Exchange 2003 RC0
6.5.6595.0 – Exchange 2003 RC1-Candidate
6.0.3790.0 – Exchange 2003 RTM