Given the recent news from Microsoft and their on-prem email service MS Exchange issue on January 1st: So, here is a blast from the past: Some people have asked me if the recently reported issues with dates on Microsoft Exchange on-prem are a repeat of Y2K. While the similarities are embarrassingly serious, the scope is not as wide as Y2K and the solution is much simpler than its predecessor event from 22 years ago. Please read on for background and details.