Microsoft SharePoint 2007 is Installed (Upgrade Advisor)
Upgrade Advisor detected an unsupported version of a SharePoint product or technology.
Applies to: Reporting Services SharePoint mode.
To continue with upgrade, you must either uninstall SharePoint 2007 or upgrade SharePoint 2007 to a SharePoint 2010 product. After you have updated your SharePoint installation, re-run Upgrade Advisor to confirm that there are no other upgrade issues.
It is not possible to directly upgrade from SharePoint 2007 to SharePoint 2013. but you can do what is referred to as a “double-hop” database attach to upgrade from Office SharePoint Server 2007 to SharePoint Server 2010, and then from SharePoint Server 2010 to SharePoint Server 2013.