Dood, get an upgrade!
<img src="http://dl.dropbox.com/u/34306693/activeuser.png" border="0" />
Most likely fake. Most spambots report fake browser information.
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Yea. I thought so too, but I also thought it was amusing. If you're gonna report false, at least report something half modern - stupid spambots :)
It can be search crawlers too - sometimes they masquerade as users on old machines to see if the site holds up/still works/isn't showing something else to the search crawler.