I've installed QGIS 2.16.3-1 on Windows 10 via the OSGeo4W 64-bit installer and also selected the following packages:
- grass (7.0.5-1)
- qgis-grass-plugin7 (2.16.3-1)
- qgis-grass-plugin-common (2.16.3-1)
I can't find the GRASS plugin in the list of plugins at Plugins > Manage and Install Plugins > Installed (panel)
And the QGIS Browser can see the grass location and mapset folder, but doesn't have the GRASS icon like it does in Linux. So layers can't be added to the map. I guess that means that the gdal-grass plugin is unavailable as well.
I tried launching QGIS Desktop 2.16.3 with GRASS 7.0.4 but get the same results as above. Maybe the GRASS version mismatch is a problem or just a shortcut name typo.