i use opera constantly, and i love it. but i hate when big sites lock me out, and tell me to upgrade to i.e. 5. so this time i ranted at the webmaster.
i got a very polite response basically saying that they dont support opera or moz because of security and usability issues, and suggesting i co-install I.E. (thanks to dr doc et al i have three versions of i.e., i just dont like them:))
I was under the impression that recent versions of these opera and moz were more secure than i.e. - is this not so?
IMHO, the webmaster was just saying security hoping you'd have no clue and would just believe him. Usability issues is another pair of shoes. I guess that site was done for IE, using IE "features" (in other words bugs).
As for Opera and Moz being more secure, I wouldn't say that. Thing is, less people are using it, so hackers concentrate on IE.