Opera won't unseat Internet Explorer as the top Windows browser in the foreseeable future. But judging from the latest version 7, the plucky Norwegian browser is actively seeking to wrest the number-two spot from Mozilla/Netscape. Opera 7 is roughly the same size as the previous version, yet adds a number of new and improved features -- from a slick new email client to simplified password management. The interface looks a bit cluttered, and we found a few HTML page-formatting glitches along the way, but this is still a solid upgrade. Current Opera users -- especially those who use the built-in email client -- should upgrade now to get the benefits of the nifty email program. And even if you're happy with your non-Opera browser and email, give the free trial a whirl. You may find the email client hard to resist.