The IBM domino platform is used by enterprises as an application platform. Many of these companies have built their applications and web-applications on this system, which offers document management, workflow and messaging.
IBM Domino and IBM Notes are by design resilient and supports real-time clustering. Applications are backward compatible and support older versions of databases with a timespan of over 10 years! Many interfaces with production or business applications can be created in this platform. The IBM Domino systems are built to support different platforms. (Windows, UX or Linux)
Large enterprises invest in long term solutions and try to avoid the worry of having to migrate all their applications to newer platforms every time a new version is launched. The discussion about legacy and the older interface that is visible is a valid discussion, however the higher security and performance of this platform outweighs this.
If or when you need to migrate your IBM Domino platform to a newer version or if you need to migrate to Microsoft, I can provide your IT team with the expertise needed to perform such complex tasks.