Due to the experimental nature of this release, upgrading a previous Opera installation is not recommended. If you'd like to test your mail from 7.23 in this release, delete the OperaMail folder, then copy your entire Mail folder from 7.23 to your 7.50 Preview 6 installation.

Download Opera Preview 6 Build 3768

Release notes:
- The installer no longer tries to force installation in a new directory, so be careful where you're installing
- Due to all the recent changes in toolbar customization, we've bumped the toolbar version. All old toolbar customization files will no longer work

A detailed list of changes will soon be available at
http://snapshot.opera.com/windows/w750p6.html#detail.