I have successfully managed to create an ArcGIS for windows mobile (10.1.1.0) project that includes a feature service from ArcGIS Online (AGOL).
When I synchronise edits, the features created on the mobile device are updated in AGOL, but any edits made in AGOL are not included on the mobile device. Except (this is the odd bit) where a feature was originally created on the mobile device, for example, if a feature created on the mobile device is deleted on AGOL, then sync'd, the feature will no longer be there on the mobile device either.
I hope that makes sense.
Any ideas???
Stuart