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Leapfrog migration is the process of upgrading directly to the newest version of an application without having to migrate through in-between versions first.
Microsoft offers a serial approach to migration. Microsoft SharePoint, for example, often requires sequential migration though there are ways to leapfrog and migrate from, say, SharePoint 2007 to SharePoint 2013. A few third-party tools provide a way to upgrade to SharePoint 2013 from any previous version.