The acronyms in that story led me down the memory lane - In the early 2000s, I worked at Microsoft building the Outlook to Notes connector. The theory was that we could introduce MS Outlook to hardcore Lotus/Domino/Notes shops and that would be a trojan horse to the introduction of Exchange (and its high priced client access licenses).

Reading through the article, it seems like that theory was proven out and along with the awful UI that Notes was, it led to many IBM shops adopting Exchange/Outlook and later SharePoint.

Something odd about Lotus Notes/Domino, and part of the reason for its awful UI, is that everything is a database (the NSF mentioned in the article). All UI is a view on that database. Viewing an email? That's just view on a item in the database. Sending an email? That's just adding a row into the 'Outbox' table. The entire product was built with this paradigm at the center of it all.