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"Mozilla/5.0 (compatible; MSIE 5.0; Windows 98)"
This indicates a Internet Explorer 5.0 browser. The reason the string commences with Mozilla/5.0 is to ensure that web sites believe the browser is compliant and can display their content. This is a hangover from the days in which web sites often would only display their content to Netscape browsers (which identified themselves with the string 'Mozilla').
MSIE 5 will not report as Mozilla 5; all Windows MSIE releases to date, including AOL, will report as Mozilla/4.0 (compatible); Compuserve 7 and AOL 5+ (MacOSX) clients are Gecko browsers and will report as Mozilla/5.0 (compatible).
[edited by: choster at 2:29 pm (utc) on July 21, 2003]
Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01
Mozilla/5.0 (Slurp/si; email@example.com; [inktomi.com...]
Mozilla/5.0 (Slurp/cat; firstname.lastname@example.org; [inktomi.com...]
Mozilla/5.0 (Macintosh; U; PPC; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02
Mozilla/5.0 (Macintosh; U; PPC; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01
Mozilla/5.0 (compatible; Konqueror/3.1-rc3; i686 Linux; 20020214)
Mozilla/5.0 (compatible; Konqueror/3.0-rc3; i686 Linux; 20020904)
1) *all* browsers that have come out of the Mozilla project are referring to themselves as Mozilla/5.0 - regardless of OS, CPU etc.
2) each and every present version of IE will identify itself as Mozilla/4.0
3) Safari for Mac and Konqueror for Linux gives Mozilla/5.0
Netscape 5 was as far as I know never released - they went from 4.x to 6.x skipping the 5.0 version when the Mozilla OSS was created - this to keep the numbering on par featurewise with IE.
jm_uk is simply wrong. IE has never used the Mozilla/5.0 identifier