I have upgraded from ArcGIS 10.0 to ArcGIS 10.3.1 and I noticed that I lost my Folder Connections in the process. Is there a way to recover my folder connections from ArcGIS 10.0? I have all my local files on the c: drive backed up.
I ended up copying my whole ArcCatalog folder to the 10.3.1 location and that restored my folder connections.
However, I also performed a test and discovered that when I added a new folder connection, in ArcMap, that the file C:...\ESRI\Desktop10.0\ArcCatalog\ArcCatalog.gx file was updated with the same date and time as when the folder connection was created. I suspect that's the file that contains the folder connection information. If anybody can confirm that, please post a comment here.
esri documentation on recovering connections