From the Opera blog post:
Last year we started our journey to bring Opera Mini, already used by millions, to Windows Phone. We approached it carefully, because rebuilding Opera Mini from scratch for a new platform is no joke. We wanted to give you an app that works.
We released the beta version of Opera Mini for Windows Phone several months back, and all your feedback is paying off. Today, we have released Opera Mini for Windows Phone as a stable version.
The changelog is summarised by Opera itself as:
- You wanted a browser that looks good on your Windows Phone. It now sports a truly native look and feel.
- You asked for more control. Opera Mini for Windows Phone gives you a daily, weekly or monthly view of your data savings.
- You asked for easier downloading. We’ve improved the download manager so that you’re in control of what, when and where your downloads are going.
- You called for better access to your favorite sites. Save and preview your favorite websites with Speed Dial and bookmarks.
You can grab Opera Mini here in the Store. The Opera team did say that "over the next few months, you will see additional improvements", so there's more to come.
See also the Opera Mini FAQ. And the official, rather err... 'poptastic' introductory video: