Yeah, we've got a client who still uses IE for Mac, and refuses to consider using Safari, or anything else, as his feeling is that the internet should conform to him and his browser, not the other way around.
I had a report from the manager in another company who bought our hosted solution that everything was misaligend.
Turned out clicking a link from an email opened Netscape Navigator 4 for him!
Normally he uses Internet Explorer if he clicks on Internet on his desktop
I soon received an email that the website was not working for someone. The screenshot showed that the browser they were using was Lotus Notes.
They were clicking on the link in their email and it was opening it in Lotus freaking Notes.
"Uh, no, we don't support that."