The sheer number of those on-premises software customizations, some of which were made decades ago, can be jaw-dropping. One company that Lindner and his team worked with had 15,000 such customizations, but once the company took a hard look at them, it found that it wasn't using many of them and that others wouldn't be needed because its cloud replacement provided comparable functionality. In the end, the company had to build only 15 extensions to its cloud software to support certain specific needs.