Opera users have always been one of the outsiders to most web developers because of the low market share that the browser holds. Nevertheless, Opera has been implementing web standards quite quickly compared to other popular browsers. And so was the case with Gmail, where Opera users had to use the ”nocheckbrowser” parameter to see the newer Gmail2 interface. But that’s no more required, since Google has made changes and now Opera 9.51 and higher displays the new Gmail2 interface by default.
So there you have it now... Enjoy Gmail 2 on Opera without any quirks or problems!