Desktask, as of RC2 as some problems related with Outlook language editions.
The query to find items between a certain date don't work in the portuguese version, and it seems that it has the same problem with categories, this time in the German Outlook version.

As my resources are limited, I cannot at the present time test DeskTask under this editions (or other language editions) so at present time, there is no workaround.

Other then that, problems related to bugs reported in the forum are taken care for the RC3 release.
The RC3 version should be released soon