Opera 11 is a web browser developed by Opera Software ASA, available for download in full install version for Windows platforms from legacy sources. This version of Opera was officially released on 2010-12-16 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Opera 11 has been built on Presto 2.7 rendering engine and there are about 15 builds from its beta version released on 23-Nov-2010 to the final edition 11.64 released as late as on 10-May-2012 spanning more than fifteen months.

There are huge chunk of changes in this edition and important one among them includes in Address Field, Bookmarks Bar, introduction of Auto Updater, New installer, and introduction of extensions.

Address field now hides the complexity of long web addresses and security of the webpage gets a badge which represents & replaces the protocols like HTTP & HTTPS. Now Opera's auto updater automatically updates the latest versions of unit applications and extensions, thus removing the security vulnerabilities.

Now Old Personal bar has been replaced with Bookmarks Bar which can be enabled from view menu.