Merging cumulative updates into your own Microsoft Dynamics NAV solutions has become a lot easier with the new merge utilities. They are based on the concept of three-way merge to reconcile two sets of changes made (independently) to a given base version. For example, when applying Microsoft Dynamics NAV 2015 Cumulative Update 1 to a customized database, the customized database and the cumulative update are both derived from Microsoft Dynamics NAV 2015 RTM, which is the shared based version in that case.