That said AI methods have (slightly) diffused into the mainstream
The ability of MS Outlook's calendar function to cope with relative times like "next week" is due to a (limited) English language parser.
Probably not quite as good as the same capability in Lotus Agenda.
In fact I'm not sure any system has allowed the system to structure (or restructure) data without direct user instructions as freely as Agenda.
A system that makes deductions on your data and acts accordingly requires a high level of trust from its users, which apparently few were prepared to provide.