regarding: ArcGIS 10.0 SP3 (Desktop and ArcGIS Explorer 1750) File Menu Performance Patch
01-09-2012 - PATCH
ESRI has altered the location of the configuration xml file for the AddinFolderList (using server deployment of addins)
For windows 7:
The original location was
C:\Users\" & Environment.UserName & "\AppData\Local\ESRI\Desktop10.0\AddinFoldersList.xml"
The NEW location is:
C:\Users\" & Environment.UserName & "\AppData\Roaming\ESRI\Desktop10.0\AddinFoldersList.xml"
Exciting when company wide install a patch, and they all loose Server Addins. 😉