Depends what you mean, I reckon it's a question for Charley - but did you link to a post with a URL, or anctually uploaded and sent a document you found somwhere off this site. I reckon the chances of this site being able to infect your email are almost zero, but the chances you PC has been infected though another means is much more likely. Certianly I view this site via my company PC and it has never flagged a problem, and also the company Charley uses to host the site almost certainly routinely scan all their servers for virus.
Has your PC got adequate anti-virus software, a comprehensive firewall, and been patched with all the latest updates from Microsoft?
[Edit} Sorry, lots of that isn't relevant, its only the link, not the email itself - I reckon either, its something to do with his broswer, or software, or hotmail is having a tizzy, when you send a link to a hotmail address, hotmail insists on opening it in a new frame, with loads of microsoft gubbins inthe address bar. I'd get him to type it in directly, cut and pasting does not work in this cirumstance, as it picks up all the microsoft stuff as well.
Adam