The current trial version of ORF (4.3) supports Exchange 2010 after installing a patch, but you may receive an error if you try to install the registered build on top of this patched trial version. That is because the installer of 4.3 registered does not incorporate the Exchange 2010 patch by default.

To solve this problem, you should simply ignore the installation error during the conversion process, install the patch again for the registered build, then issue the following command in the ORF installation directory:

orfainst -install

This will be addressed by the upcoming 4.4 version, which includes the patch by default.