Hello Darryl,
You should probably address this question to Trimble, but my understanding is on a windows 7 based device (Yuma) Timble positions writes an extra column to the database and requires the data to be post processed. On a windows embedded device (Juno, GeoXT, Nomad) Timble positions corrects the GPS data on-the-fly and passes it to ArcGIS Mobile 3.1 / 10.1.1.
Cheers
Gordon