2001
C:\Program Files\SharePoint Portal Server\
http://technet.microsoft.com/en-us/library/cc768027.aspx
2003
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60
http://technet.microsoft.com/en-us/library/cc288250(v=office.12).aspx
2007
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12
%commonprogramfiles%/Microsoft Shared/web server extensions/12
http://technet.microsoft.com/en-us/library/cc721635(v=office.12).aspx
http://technet.microsoft.com/en-us/library/cc721634(v=office.12).aspx
2010
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14
%commonprogramfiles%/Microsoft Shared/web server extensions/14
http://technet.microsoft.com/en-us/library/cc721634(v=office.14).aspx
2013
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15
%commonprogramfiles%/Microsoft Shared/web server extensions/15
http://social.technet.microsoft.com/wiki/contents/articles/25431.sharepoint-2013-the-15-hive-and-other-important-directories.aspx
2015
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16
%commonprogramfiles%/Microsoft Shared/web server extensions/16