The ability of MapInfo Professional version 10 which will be released for direct access PostGIS is one of the excellent features provided GIS software from Pitney Bowes this. Is ArcGIS is able to connect with PostGIS?

PostGIS is a PostgreSQL server that "spatially enables", which is used as a backend spatial database for geographic information systems (GIS), such as ESRI SDE or Oracle's Spatial extension. In contrast to the two last-mentioned database servers, PostGIS is an open source software under the GNU General Public License.
To make the connection between ArcGIS with PostGIS, it takes an additional extension, namely zigGIS. With ArcGIS Desktop zigGIS able to directly connect with the spatial data stored in PostGIS. Spatial data can be displayed in ArcMap canvas, in the analysis and in the edit in ArcMap.

The most interesting feature is the ability to perform multi-user editing PostGIS data from ArcMap using the editing functions are available in ArcMap.