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SharePoint 2013 /_layouts/15 vs /_layouts folder differences
In SharePoint 2013 it’s possible to install both SharePoint 2010 and 2013 solutions, which is supported by having two folders – one for the Sp2010 (“14”) hive files and one for the SP 2013 (“15”) hive files. In IIS a virtual directory called 15 now exists in the _layouts folder of the SharePoint web application. If your legacy…