Spatial Reference issue

[KennethKirkeby]

I received a project with a shapefile from another department.  When I try and load it into ArcMap 10.2.1, I receive the following:

Properties:

Just looking for some direction on how to resolve. I understand the distinction between Geographic Cood. Sys. vs Projections but I'm struggling to identify, if this is my issue.

[DanPatterson_Retired]

Looks like someone used the define projection tool, and defined it as a geographic coordinate system (GCS wgs84)

And given the extents that is totally absurd.  Since it was a shapefile, locate the *.prj file and rename it to *.xxx and reload the shapefile.  It will probably load but it will tell you it doesn't have a defined projection.

Perhaps someone meant to give it a Web Mercator projection instead if you are using webby data sources