stssync sharepoint Tasks cannot use uid parameter

When using stssync for synchronising tasks with outlook the uid parameter has no effect.

I expect that only tasks from that user are shown. 

But if i use the uid parameter no task is shown. When omitting parameter all tasks are shown.  

I tried different user ID's (my ID is 8 from _spPageContextInfo or /_catalogs/users/simple.aspx)

Info from http://msdn.microsoft.com/de-de/library/office/ms457051(v=office.14).aspx