https://techcrunch.com/2018/09/06/microsoft-commits-to-fixing-custom-apps-broken-by-latest-windows-updates/

Microsoft wants to make life easier for enterprise customers. Starting today, it is committing to fix any custom applications that may break as a result of updates to Windows 10 or the Office 365 product suite.

Most large companies have a series of custom applications that play a crucial role inside their organizations. When you update Windows and Office 365, Murphy’s Law of updates says one or more of those applications is going to break.