I really hate it when the links in Pocket Outlook open up in Pocket Internet Explorer, a truly useless piece of software. In fact, the only time I ever use Pocket Internet Explorer is to browse Orb.com since I like the dumbed down mobile version of the site.
To have all your Pocket Outlook links open up in the outstanding Opera Mobile you have installed on the HTC Fuze, modify the following registry settings:
[HKLM\SOFTWARE\Microsoft\Shell\Rai\: DEFBROWSER]
1 = operal.exe
Tried this solution, it does however not work on my xperia X1, i get an error saying operal.exe is not a certified application and can therefore not be used.
I’m not familiar with the Xperia X1, but I’m under the impression that it runs a custom shell… not the HTC Touch Flo 3D shell. Therefore, I cannot speak to your error message. However, if you were to drop out of the shell into Windows Mobile proper, I bet it would work… though I doubt that is an enticing solution.