Here's a summary culled from:
http://leb.net/hzo/ioscount/data/r.9901.txt
Host OS recognized %recog
------------------ ------
Linux 30.8
Solaris/SunOS 19.1
Windows 95/98/NT 18.4
BSD Family 16.2
IRIX 5.7
AIX 1.9
Mac/Apple 1.7
Reliant Unix/Sinix 1.4
HPUX 1.1
Digital Unix 0.5
SCO Unix 0.4
Novel Netware 0.4
There are further breakdowns at:
http://leb.net/hzo/ioscount/data/r.9901.ftp.txt
http://leb.net/hzo/ioscount/data/r.9901.news.txt
http://leb.net/hzo/ioscount/data/r.9901.www.txt
Bye,
Rob.