Well I'm using WinXP, but if you look in your server stats you can find out exactly.

My visitors this month are using:
Unknown 3,811 - - 54.14%
Windows XP 2,728 - - 38.76%
Windows 2000 233 - - 3.31%
Windows 98 114 - - 1.62%
Macintosh OS X 61 - - 0.87%
Windows ME 26 - - 0.37%
Linux 22 - - 0.31%
Windows NT 21 - - 0.30%
Macintosh PPC 13 - - 0.19%
Windows 2003 6 - - 0.09%
Windows 95 4 - - 0.06%

Not sure what the "unknown" means... I guess they're Linux-type bots.

Cheers,
Paz.

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10.3 million entries for Hotels in Turkey but I'm still chipping away.